Source: https://divineoffice.org/general-instructions/
Timestamp: 2019-04-21 23:13:07+00:00

Document:
The witness of the early Church teaches us that individual Christians devoted themselves to prayer at fixed times. Then, in different places, it soon became the established practice to assign special times for common prayer, for example, the last hour of the day when evening draws on and the lamp is lighted, or the first hour when night draws to a close with the rising of the sun.
In the course of time other hours came to be sanctified by prayer in common. These were seen by the Fathers as foreshadowed in the Acts of the Apostles. There we read of the disciples gathered together at the third hour.  The prince of the apostles “went up on the housetop to pray, about the sixth hour” (10:9); “Peter and John were going up to the temple at the hour of prayer, the ninth hour” (3:1); “about midnight Paul and Silas were praying and singing hymns to God” (16:25).
2. Such prayer in common gradually took the form of a set cycle of hours. This liturgy of the hours or divine office, enriched by readings, is principally a prayer of praise and petition. Indeed, it is the prayer of the Church with Christ and to Christ.
3. When the Word, proceeding from the Father as the splendor of his glory, came to give us all a share in God’s life, “Christ Jesus, High Priest of the new and eternal covenant, taking human nature, introduced into this earthly exile the hymn of praise that is sung throughout all ages in the halls of heaven.”  From then on in Christ’s heart the praise of God assumes a human sound in words of adoration, expiation, and intercession, presented to the Father by the Head of the new humanity, the Mediator between God and his people, in the name of all and for the good of all.
6. Since we are entirely dependent on God, we must acknowledge and express this sovereignty of the Creator, as the devout people of every age have done by means of prayer.
Prayer directed to God must be linked with Christ, the Lord of all, the one Mediator  through whom alone we have access to God. He unites to himself the whole human community  in such a way that there is an intimate bond between the prayer of Christ and the prayer of all humanity. In Christ and in Christ alone human worship of God receives its redemptive value and attains its goal.
7. There is a special and very close bond between Christ and those whom he makes members of his Body, the Church, through the sacrament of rebirth. Thus, from the Head all the riches belonging to the Son flow throughout the whole Body: the communication of the Spirit, the truth, the life, and the participation in the divine sonship that Christ manifested in all his prayer when he dwelt among us.
Christ’s priesthood is also shared by the whole Body of the Church, so that the baptized are consecrated as a spiritual temple and holy priesthood through the rebirth of baptism and the anointing by the Holy Spirit  and are empowered to offer the worship of the New Covenant, a worship that derives not from our own powers but from Christ’s merit and gift.
The excellence of Christian prayer lies in its sharing in the reverent love of the only-begotten Son for the Father and in the prayer that the Son put into words in his earthly life and that still continues without ceasing in the name of the whole human race and for its salvation, throughout the universal Church and in all its members.
8. The unity of the Church at prayer is brought about by the Holy Spirit, who is the same in Christ,  in the whole Church, and in every baptized person. It is this Spirit who “helps us in our weakness” and “intercedes for us with longings too deep for words” (Rom 8:26). As the Spirit of the Son, he gives us “the spirit of adopted children, by which we cry out: Abba, Father” (Rom 8:15; see Gal 4:6; 1 Cor 12:3; Eph 5:18; Jude 20). There can be therefore no Christian prayer without the action of the Holy Spirit, who unites the whole Church and leads it through the Son to the Father.
Though prayer in private and in seclusion  is always necessary and to be encouraged  and is practiced by the members of the Church through Christ in the Holy Spirit, there is a special excellence in the prayer of the community. Christ himself has said: “Where two or three are gathered together in my name, I am there in their midst” (Mt 18:20).
The liturgy of the hours is in turn an excellent preparation for the celebration of the eucharist itself, for it inspires and deepens in a fitting way the dispositions necessary for the fruitful celebration of the eucharist: faith, hope, love, devotion, and the spirit of self-denial.
The prophets came almost to a vision of this liturgy of heaven as the victory of a day without night, of a light without darkness: “The sun will no more be your light by day, and the brightness of the moon will not shine upon you, but the Lord will be your everlasting light” (Is 60:19; see Rv 21:23 and 25). “There will be a single day, known to the Lord, not day and night, and at evening there will be light” (Zech 14:7). Already “the end of the ages has come upon us (see I Cor 10:11) and the renewal of the world has been irrevocably established and in a true sense is being anticipated in this world.”  By faith we too are taught the meaning of our temporal life, so that we look forward with all creation to the revealing of God’s children.  In the liturgy of the hours we proclaim this faith, we express and nourish this hope, we share in some degree the joy of everlasting praise and of that day that knows no setting.
19. Mind and voice must be in harmony in a celebration that is worthy, attentive, and devout, if this prayer is to be made their own by those taking part and to be a source of devotion, a means of gaining God’s manifold grace, a deepening of personal prayer, and an incentive to the work of the apostolate.  All should be intent on cooperating with God’s grace, so as not to receive it in vain. Seeking Christ, penetrating ever more deeply into his mystery through prayer  they should offer praise and petition to God with the same mind and heart as the divine Redeemer when he prayed.
20. The liturgy of the hours, like other liturgical services, is not a private matter but belongs to the whole Body of the Church, whose life it both expresses and affects.  This liturgy stands out most strikingly as an ecclesial celebration when, through the bishop surrounded by his priests and ministers,  the local Church celebrates it. For “in the local Church the one, holy, catholic, and apostolic Church is truly present and at work.”  Such a celebration is therefore most earnestly recommended. When, in the absence of the bishop, a chapter of canons or other priests celebrate the liturgy of the hours, they should always respect the true time of day and, as far as possible, the people should take part. The same is to be said of collegiate chapters.
24. Communities of canons, monks, nuns, and other religious who celebrate the liturgy of the hours by rule or according to their constitutions, whether with the general rite or a particular rite, in whole or in part, represent in a special way the Church at prayer. They are a fuller sign of the Church as it continuously praises God with one voice and they fulfill the duty of “working,” above all by prayer, “to build up and increase the whole Mystical Body of Christ, and for the good of the local Churches.”  This is especially true of those living the contemplative life.
26. Men and women religious not bound to a common celebration, as well as members of any institute of perfection, are strongly urged to gather together, by themselves or with the people, to celebrate the liturgy of the hours or part of it.
29. Hence bishops, priests, and other sacred ministers, who have received from the Church the mandate to celebrate the liturgy of the hours (see no. 17), should recite the full sequence of hours each day, observing as far as possible the true time of day.
They should, first and foremost, attach due importance to those hours that are, so to speak, the two hinges of the liturgy of the hours, that is, morning prayer and evening prayer, which should not be omitted except for a serious reason.
In order to sanctify the whole day more completely, they will also treasure the recitation of daytime prayer and night prayer, to round off the whole Opus Dei and to commend themselves to God before retiring.
31. a. Cathedral and collegiate chapters should celebrate in choir those parts of the liturgy of the hours that are prescribed for them by the general law or by particular law.
b. Religious communities bound to the recitation of the liturgy of the hours and their individual members should celebrate the hours in keeping with their own particular law; but the prescription of no. 29 in regard to those in holy orders is to be respected.
Communities bound to choir should celebrate the whole sequence of the hours daily in choir;  when absent from choir their members should recite the hours in keeping with their own particular law; but the prescriptions in no. 29 are always to be respected.
33. The structure of the liturgy of the hours follows laws of its own and incorporates in its own way elements found in other Christian celebrations. Thus it is so constructed that, after a hymn, there is always psalmody, then a long or short reading of sacred Scripture, and finally prayer of petition.
In a celebration in common and in private recitation the essential structure of this liturgy remains the same, that is, it is a conversation between God and his people. Celebration in common, however, expresses more clearly the ecclesial nature of the liturgy of the hours; it makes for active participation by all, in a way suited to each one’s condition, through the acclamations, dialogue, alternating psalmody, and similar elements. It also better provides for the different literary genres that make up the liturgy of the hours.  Hence, whenever it is possible to have a celebration in common, with the people present and actively taking part, this kind of celebration is to be preferred to one that is individual and, as it were, private.  It is also advantageous to sing the office in choir and in community as opportunity Offers, in accordance with the nature and function of the individual parts.
In this way the Apostle’s exhortation is obeyed: “Let the word of Christ dwell in you in all its fullness, as you teach and counsel each other in all wisdom by psalms, hymns, and spiritual canticles, singing thankfully to God in your hearts” (Col 3:16; see Eph 5:19-20).
In place of Ps 95, Ps 100, Ps 67, or Ps 24 may be used as circumstances may suggest.
It is preferable to recite the invitatory psalm responsorially as it is set out in the text, that is, with the antiphon recited at the beginning, then repeated, and repeated again after each strophe.
35. The invitatory is placed at the beginning of the whole sequence of the day’s prayer, that is, it precedes either morning prayer or the office of readings, whichever of these liturgical rites begins the day. The invitatory psalm with its antiphon may be omitted, however, when the invitatory is the prelude to morning prayer.
36. The variation of the invitatory antiphon, to suit the different liturgical days, is indicated at its place of occurrence.
40. Morning prayer and evening prayer are therefore to be accorded the highest importance as the prayer of the Christian community. Their public or communal celebration should be encouraged, especially in the case of those who live in community. Indeed, the recitation of these hours should be recommended also to individual members of the faithful unable to take part in a celebration in common.
41. Morning prayer and evening prayer begin with the introductory verse, God come to my assistance. Lord, make haste to help me. There follows the Glory to the Father, with As it was in the beginning and Alleluia (omitted in Lent). This introduction is omitted at morning prayer when the invitatory immediately precedes it.
42. Then an appropriate hymn is sung immediately. The purpose of the hymn is to set the tone for the hour or the feast and, especially in celebrations with a congregation, to form a simple and pleasant introduction to prayer.
43. After the hymn the psalmody follows, in accordance with the rules laid down in nos. 121-125. The psalmody of morning prayer consists of one morning psalm, then a canticle from the Old Testament and, finally, a second psalm of praise, following the tradition of the Church.
The psalmody of evening prayer consists of two psalms (or two parts of a longer psalm) suited to the hour and to celebration with a congregation and a canticle from the letters of the apostles or from the Book of Revelation.
44. After the psalmody there is either a short reading or a longer one.
45. The short reading is provided to fit the day, the season, and the feast. It is to be read and received as a true proclamation of God’s word that emphasizes some holy thought or highlights some shorter passages that may be overlooked in the continuous cycle of Scripture readings.
The short readings are different for each day of the psalter cycle.
46. Especially in a celebration with a congregation, a longer Scripture reading may be chosen either from the office of readings or the Lectionary for Mass, particularly texts that for some reason have not been used. From time to time some other more suitable reading may be used, in accordance with the rules in nos. 248-249 and 251.
47. In a celebration with a congregation a short homily may follow the reading to explain its meaning, as circumstances suggest.
48. After the reading or homily a period of silence may be observed.
49. As a response to the word of God, a responsorial. chant or short responsory is provided; this may be omitted. Other chants with the same purpose and character may also be substituted in its place, provided these have been duly approved by the conference of bishops.
50. Next is the solemn recitation of the gospel canticle with its antiphon, that is, the Canticle of Zechariah at morning prayer and the Canticle of Mary at evening prayer. Sanctioned by age-old popular usage in the Roman Church, these canticles are expressions of praise and thanksgiving for our redemption. The antiphon for each canticle is indicated, according to the character of the day, the season, or the feast.
51. After the canticle, at morning prayer come the petitions for the consecration of the day and its work to God and at evening prayer, the intercessions (see nos. 179-193).
52. After the petitions or intercessions the Lord’s Prayer is said by all.
53. Immediately after the Lord’s Prayer there follows the concluding prayer, which for weekdays in Ordinary Time is found in the psalter and for other days in the proper.
54. Then, if a priest or deacon is presiding, he dismisses the congregation with the greeting, The Lord be with you, and the blessing as at Mass. He adds the invitation, Go in peace. R. Thanks be to God. In the absence of a priest or deacon the celebration concludes with May the Lord bless us, etc.
56. But prayer should accompany “the reading of sacred Scripture so that there may be a conversation between God and his people: ‘we talk with God when we pray, we listen to him when we read God’s words.”  For this reason the office of readings consists also of psalms, a hymn, a prayer, and other texts, giving it the character of true prayer.
58. Those who are obliged by their own particular law and others who commendably wish to retain the character of this office as a night office of praise (either by saying it at night or very early in the morning and before morning prayer), during Ordinary Time choose the hymn from the selection given for this purpose. Moreover, for Sundays, solemnities, and certain feasts what is said in nos. 70-73 about vigils must be kept in mind.
59. Without prejudice to the regulations just given, the office of readings may be recited at any hour of the day, even during the night hours of the previous day, after evening prayer has been said.
60. If the office of readings is said before morning prayer, the invitatory precedes it, as noted (nos. 34-36). Otherwise it begins with the verse, God, come to my assistance with the Glory to the Father, As it was in the beginning, and the Alleluia (omitted in Lent).
61. Then the hymn is sung. In Ordinary Time this is taken either from the night selections, as already indicated (nos. 34-36), or from the morning selections, depending on what the true time of day requires.
62. The psalmody follows and consists of three psalms (or parts in the case of longer psalms). During the Easter triduum, on days within the octaves of Easter and Christmas, on solemnities and feasts, the psalms are proper, with their proper antiphons.
On Sundays and weekdays, however, the psalms and their antiphons are taken from the current week and day of the psalter. On memorials of the saints they are similarly taken from the current week and day of the psalter, unless there are proper psalms or antiphons (see nos. 218ff.).
63. Between the psalmody and the readings there is, as a rule, a verse, marking a transition in the prayer from psalmody to listening.
64. There are two readings: the first is from the Scriptures, the second is from the writings of the Fathers or church writers, or else is a reading connected with the saints.
65. After each reading there is a responsory (see nos. 169-172).
66. The scriptural reading is normally to be taken from the Proper of Seasons, in accordance with the rules to be given later (nos. 140-155). On solemnities and feasts, however, it is taken from the proper or the common.
67. On solemnities and feasts of saints a proper second reading is used; if there is none, the second reading is taken from the respective Common of Saints. On memorials of saints when the celebration is not impeded, the reading in connection with the saint replaces the current second reading (see nos. 166 and 235).
68. On Sundays outside Lent, on days within the octaves of Easter and Christmas, and on solemnities and feasts the Te Deum is said after the second reading with its responsory but is omitted on memorials and weekdays. The last part of this hymn, that is, from the verse, Save your people, Lord to the end, may be omitted.
69. The office of readings normally concludes with the prayer proper to the day and, at least in recitation in common, with the acclamation, Let us praise the Lord. R. And give him thanks.
71. As with the Easter Vigil, it was customary to begin certain solemnities (different in different Churches) with a vigil. Among these solemnities Christmas and Pentecost are preeminent. This custom should be maintained and fostered, according to the particular usage of each Church. Whenever it seems good to add a vigil for other solemnities or pilgrimages, the general norms for celebrations of the word should be followed.
72. The Fathers and spiritual writers have frequently encouraged Christians, especially those who lead the contemplative life, to pray during the night. Such prayer expresses and awakens our expectation of the Lord’s Second Coming: “At midnight the cry went up: ‘See, the bridegroom is coming, go out to meet him… (Mt 25:6). “Keep watch, then, for you do not know when the master of the house is coming, whether late or at midnight or at cockcrow or in the morning, so that if he comes unexpectedly he may not find you sleeping” (Mk 13:35-36). All who maintain the character of the office of readings as a night office, therefore, are to be commended.
73. Further, since in the Roman Rite the office of readings is always of a uniform brevity, especially for the sake of those engaged in apostolic work, those who desire, in accordance with tradition, to extend the celebration of the vigils of Sundays, solemnities, and feasts should do so as follows.
First, the office of readings is to be celebrated as in The Liturgy of the Hours up to the end of the readings. After the two readings and before the Te Deum canticles should be added from the special appendix of The Liturgy of the Hours. Then the gospel should be read; a homily on the gospel may be added. After this the Te Deum is sung and the prayer said.
On solemnities and feasts the gospel is to be taken from the Lectionary for Mass; on Sundays, from the series on the paschal mystery in the appendix of The Liturgy of the Hours.
74. Following a very ancient tradition Christians have made a practice of praying out of private devotion at various times of the day, even in the course of their work, in imitation of the Church in apostolic times. In different ways with the passage of time this tradition has taken the form of a liturgical celebration.
75. Liturgical custom in both East and West has retained midmorning, midday, and midafternoon prayer, mainly because these hours were linked to a commemoration of the events of the Lord’s passion and of the first preaching of the Gospel.
The liturgical practice of saying these three hours is to be retained, without prejudice to particular law, by those who live the contemplative life. It is recommended also for all, especially those who take part in retreats or pastoral meetings.
77. Outside choir, without prejudice to particular law, it is permitted to choose from the three hours the one most appropriate to the time of day, so that the tradition of prayer in the course of the day’s work may be maintained.
78. Daytime prayer is so arranged as to take into account both those who recite only one hour and those who are obliged, or desire, to say all three hours.
93. In particular cases, if circumstances require, it is possible to link an hour more closely with Mass when there is a celebration of the liturgy of the hours in public or in common, according to the norms that follow, provided the Mass and the hour belong to one and the same office. Care must be taken, however, that this does not result in harm to pastoral work, especially on Sundays.
94. When morning prayer, celebrated in choir or in common, comes immediately before Mass, the whole celebration may begin either with the introductory verse and hymn of morning prayer, especially on weekdays, or with the entrance song, procession, and celebrant’s greeting, especially on Sundays and holydays; one of the introductory rites is thus omitted.
The psalmody of morning prayer follows as usual, up to, but excluding, the reading. After the psalmody the penitential rite is omitted and, as circumstances suggest, the Kyrie; the Gloria then follows, if required by the rubrics, and the celebrant says the opening prayer of the Mass. The liturgy of the word follows as usual.
The general intercessions are made in the place and form customary at Mass. But on weekdays, at Mass in the morning, the intercessions of morning prayer may replace the daily form of the general intercessions at Mass.
After the communion with its communion song the Canticle of Zechariah, Blessed be the Lord, with its antiphon from morning prayer, is sung. Then follow the prayer after communion and the rest as usual.
95. If public celebration of a daytime hour, whichever corresponds to the time of day, is immediately followed by Mass, the whole celebration may begin in the same way, either with the introductory verse and hymn for the hour, especially on weekdays, or with the entrance song, procession, and celebrant’s greeting, especially on Sundays and holydays; one of the introductory rites is thus omitted.
The psalmody of the hour follows as usual up to, but excluding, the reading. After the psalmody the penitential rite is omitted and, as circumstances suggest, the Kyrie; the Gloria then follows, if required by the rubrics, and the celebrant says the opening prayer of the Mass.
97. When a daytime hour or evening prayer follows Mass, the Mass is celebrated in the usual way up to and including the prayer after communion.
When the prayer after communion has been said, the psalmody of the hour begins without introduction. At the daytime hour, after the psalmody the short reading is omitted and the prayer is said at once and the dismissal takes place as at Mass. At evening prayer, after the psalmody the short reading is omitted and the Canticle of Mary with its antiphon follows at once; the intercessions and the Lord’s Prayer are omitted; the concluding prayer follows, then the blessing of the congregation.
98. Apart from Christmas eve, the combining of Mass with the office of readings is normally excluded, since the Mass already has its own cycle of readings, to be kept distinct from any other. But if by way of exception, it should be necessary to join the two, then immediately after the second reading from the office, with its responsory, the rest is omitted and the Mass begins with the Gloria, if it is called for; otherwise the Mass begins with the opening prayer.
99. If the office of readings comes immediately before another hour of the office, then the appropriate hymn for that hour may be sung at the beginning of the office of readings. At the end of the office of readings the prayer and conclusion are omitted and in the hour following the introductory verse with the Glory to the Father is omitted.
100. In the liturgy of the hours the Church in large measure prays through the magnificent songs that the Old Testament authors composed under the inspiration of the Holy Spirit. The origin of these verses gives them great power to raise the mind to God, to inspire devotion, to evoke gratitude in times of favor, and to bring consolation and courage in times of trial.
101. The psalms, however, are only a foreshadowing of the fullness of time that came to pass in Christ the Lord and that is the source of the power of the Church’s prayer. Hence, while the Christian people are all agreed on the supreme value to be placed on the psalms, they can sometimes experience difficulty in making this inspired poetry their own prayer.
102. Yet the Holy Spirit, under whose inspiration the psalms were written, is always present by his grace to those believers who use them with good will. But more is necessary: the faithful must “improve their understanding of the Bible, especially of the psalms,”  according to their individual capacity, so that they may understand how and by what method they can truly pray through the psalms.
104. To sing the psalms with understanding, then, is to meditate on them verse by verse, with the heart always ready to respond in the way the Holy Spirit desires. The one who inspired the psalmist will also be present to those who in faith and love are ready to receive his grace. For this reason the singing of psalms, though it demands the reverence owed to God’s majesty, should be the expression of a joyful spirit and a loving heart, in keeping with their character as sacred poetry and divine song and above all with the freedom of the children of God.
106. In praying the psalms we should open our hearts to the different attitudes they express, varying with the literary genre to which each belongs (psalms of grief, trust, gratitude, etc.) and to which biblical scholars rightly attach great importance.
107. Staying close to the meaning of the words, the person who prays the psalms looks for the significance of the text for the human life of the believer.
It is clear that each psalm was written in its own individual circumstances, which the titles given for each psalm in the Hebrew psalter are meant to indicate. But whatever its historical origin, each psalm has its own meaning, which we cannot overlook even in our own day. Though the psalms originated very many centuries ago among an Eastern people, they express accurately the pain and hope, the unhappiness and trust of people of every age and country, and sing above all of faith in God, of revelation, and of redemption.
109. Those who pray the psalms in the name of the Church should be aware of their full sense (sensus plenus), especially their Messianic sense, which was the reason for the Church’s introduction of the psalter into its prayer. This Messianic sense was fully revealed in the New Testament and indeed was affirmed publicly by Christ the Lord in person when he said to the apostles: “All that is written about me in the law of Moses and the prophets and the psalms must be fulfilled” (Lk 24:44). The best-known example of this Messianic sense is the dialogue in Matthew’s Gospel on the Messiah as Son of David and David’s Lord,  where Ps 110 is interpreted as Messianic.
Following this line of thought, the Fathers of the Church saw the whole psalter as a prophecy of Christ and the Church and explained it in this sense; for the same reason the psalms have been chosen for use in the liturgy. Though somewhat contrived interpretations were at times proposed, in general the Fathers and the liturgy itself had the right to hear in the singing of the psalms the voice of Christ crying out to the Father or of the Father conversing with the Son; indeed, they also recognized in the psalms the voice of the Church, the apostles, and the martyrs. This method of interpretation also flourished in the Middle Ages; in many manuscripts of the period the Christological meaning of each psalm was set before those praying by means of the caption prefixed. A Christological meaning is by no means confined to the recognized Messianic psalms but is given also to many others. Some of these interpretations are doubtless Christological only in an accommodated sense, but they have the support of the Church’s tradition.
On the great feasts especially, the choice of psalms is often based on their Christological meaning and antiphons taken from these psalms are frequently used to throw light on this meaning.
113. Even when the liturgy of the hours is recited, not sung, each psalm retains its own antiphon, which is also to be said in private recitation. The antiphons help to bring out the literary genre of the psalm; they highlight some theme that may otherwise not attract the attention it deserves; they suggest an individual tone in a psalm, varying with different contexts: indeed, as long as farfetched accommodated senses are avoided, antiphons are of great value in helping toward an understanding of the typological meaning or the meaning appropriate to the feast; they can also add pleasure and variety to the recitation of the psalms.
114. The antiphons in the psalter have been designed to lend themselves to vernacular translation and to repetition after each strophe, in accordance with no. 125. When the office of Ordinary Time is recited, not sung, the quotations printed with the psalms may be used in place of these antiphons (see no. 111).
115. When a psalm may be divided because of its length into several sections within one and the same hour, an antiphon is given for each section. This is to provide variety, especially when the hour is sung, and also to help toward a better understanding of the riches of the psalm. Still, it is permissible to say or sing the complete psalm without interruption, using only the first antiphon.
116. Proper antiphons are given for each of the psalms of morning prayer and evening prayer during the Easter triduum, on the days within the octaves of Easter and Christmas, on the Sundays of the seasons of Advent, Christmas, Lent, and Easter, on the weekdays of Holy Week and the Easter season, and from the 17th to the 24th of December.
117. On solemnities proper antiphons are given for the office of readings, morning prayer, the daytime hours, and evening prayer; if not, the antiphons are taken from the common. On feasts the same applies to the office of readings and to morning prayer and evening prayer.
118. Any memorials of the saints that have proper antiphons retain them (see no. 235).
119. The antiphons for the Canticles of Zechariah and of Mary are taken, during Ordinary Time, from the Proper of Seasons, if they are given there; if not, they are taken from the current week and day of the psalter. On solemnities and feasts they are taken from the proper if they are given there; if not, they are taken from the common. On memorials without proper antiphons the antiphon may be taken at will either from the common or from the current week.
120. During the Easter season Alleluia is added to all antiphons, unless it would clash with the meaning of a particular antiphon.
121. Different psalms may be sung in different ways for a fuller grasp of their spiritual meaning and beauty. The choice of ways is dictated by the literary genre or length of each psalm, by the language used, whether Latin or the vernacular, and especially by the kind of celebration, whether individual, with a group, or with a congregation. The reason for using psalms is not the establishment of a fixed amount of prayer but their own variety and the character proper to each.
122. The psalms are sung or said in one of three ways, according to the different usages established in tradition or experience: directly (in diredum), that is, all sing the entire psalm, or antiphonally, that is, two choirs or sections of the congregation sing alternate verses or strophes, or responsorially.
123. At the beginning of each psalm its own antiphon is always to be recited, as noted in nos. 113-120. At the end of the psalm the practice of concluding with the Glory to the Father and As it was in the beginning is retained. This is the fitting conclusion endorsed by tradition and it gives to Old Testament prayer a note of praise and a Christological and Trinitarian sense. The antiphon may be repeated at the end of the psalm.
124. When longer psalms occur, sections are marked in the psalter that divide the parts in such a way as to keep the threefold structure of the hour; but great care has been taken not to distort the meaning of the psalm.
It is useful to observe this division, especially in a choral celebration in Latin; the Glory to the Father is added at the end of each section.
It is permissible, however, either to keep this traditional way or to pause between the different sections of the same psalm or to recite the whole psalm and its antiphon as a single unit without a break.
125. In addition, when the literary genre of a psalm suggests it, the divisions into strophes are marked in order that, especially when the psalm is sung in the vernacular, the antiphons may be repeated after each strophe; in this case the Glory to the Father need be said only at the end of the psalm.
127. Since morning prayer and evening prayer are particularly designed for celebration with a congregation, the psalms chosen for them are those more suited to this purpose.
128. For night prayer the norm given in no. 88 has been followed.
129. For Sunday, including its office of readings and daytime prayer, the psalms chosen are those that tradition has particularly singled out as expressions of the paschal mystery. Certain psalms of a penitential character or connected with the passion are assigned to Friday.
130. Three psalms (78, 105, and 106) are reserved for the seasons of Advent, Christmas, Lent, and Easter, because they throw a special light on the Old Testament history of salvation as the forerunner of its fulfillment in the New.
132. Psalms too long to be included in one hour of the office are assigned to the same hour on different days so that they may be recited in full by those who do not usually say other hours. Thus Ps 119 is divided in keeping with its own internal structure and is spread over twenty-two days during daytime prayer, because tradition has assigned it to the day hours.
133. The four-week cycle of the psalter is coordinated with the liturgical year in such a way that on the First Sunday of Advent, the First Sunday in Ordinary Time, the First Sunday of Lent, and Easter Sunday the cycle is always begun again with Week I (others being omitted when necessary).
After Pentecost, when the psalter cycle follows the series of weeks in Ordinary Time, it begins with the week indicated in the Proper of Seasons at the beginning of the appropriate week in Ordinary Time.
134. On solemnities and feasts, during the Easter triduum, and on the days within the octaves of Easter and Christmas, proper psalms are assigned to the office of readings from those with a tradition of use at these times and their relevance is generally highlighted by the choice of antiphon. This is also the case at daytime prayer on certain solemnities of the Lord and during the octave of Easter. At morning prayer the psalms and canticle are taken from the Sunday of the Week I of the psalter. On solemnities the psalms at evening prayer I are taken from the Laudate Psalms, following an ancient custom. At evening prayer II on solemnities and at evening prayer on feasts the psalms and canticle are proper. At daytime prayer on solemnities (except those already mentioned and those falling on Sunday) the psalms are taken from the Gradual Psalms; at daytime prayer on feasts the psalms are those of the current week and day of the psalter.
135. In all other cases the psalms are taken from the current week and day of the psalter, unless there are proper antiphons or proper psalms.
136. At morning prayer between the first and the second psalm a canticle from the Old Testament is inserted, in accordance with custom. In addition to the series handed down from the ancient Roman tradition and the other series introduced into the breviary by St. Pius X, several other canticles have been added to the psalter from different books of the Old Testament, in order that each weekday of the four-week cycle may have its own proper canticle and on Sunday the two sections of the Canticle of the Three Children may be alternated.
137. At evening prayer, after the two psalms, a canticle of the New Testament is inserted, from the letters of the apostles or the Book of Revelation. Seven canticles are given for each week of the four-week cycle, one for each day. On the Sundays of Lent, however, in place of the Alleluia Canticle from the Book of Revelation, the canticle is from the First Letter of Peter. In addition, on the solemnity of the Epiphany and the feast of the Transfiguration the canticle is from the First Letter to Timothy; this is indicated in those offices.
138. The gospel Canticles of Zechariah, of Mary, and of Simeon are to be treated with the same solemnity and dignity as are customary at the proclamation of the gospel itself.
139. Both psalmody and readings are arranged in keeping with the received rule of tradition that the Old Testament is read first, then the writings of the apostles, and finally the gospel.
140. The reading of sacred Scripture, which, following an ancient tradition, takes place publicly in the liturgy, is to have special importance for all Christians, not only in the celebration of the eucharist but also in the divine office. The reason is that this reading is not the result of individual choice or devotion but is the planned decision of the Church itself, in order that in the course of the year the Bride of Christ may unfold the mystery of Christ “from his incarnation and birth until his ascension, the day of Pentecost, and the expectation of blessed hope and of the Lord’s return.”  In addition, the reading of sacred Scripture in the liturgical celebration is always accompanied by prayer in order that the reading may have greater effect and that, in turn, prayer – especially the praying of the psalms – may gain fuller understanding and become more fervent and devout because of the reading.
143. The cycle of readings from sacred Scripture in the office of readings takes into account both those special seasons during which by an ancient tradition particular books are to be read and the cycle of readings at Mass. The liturgy of the hours is thus coordinated with the Mass in such a way that the scriptural readings in the office complement the readings at Mass and so provide a complete view of the history of salvation.
144. Without prejudice to the exception noted in no. 73, there are no readings from the Gospel in the liturgy of the hours, since in the Mass each year the Gospel is read in its entirety.
145. There are two cycles of biblical readings. The first is a one-year cycle and is incorporated into The Liturgy of the Hours; the second, given in the supplement for optional use, is a two-year cycle, like the cycle of readings at weekday Masses in Ordinary Time.
146. The two-year cycle of readings for the liturgy of the hours is so arranged that each year there are readings from nearly all the books of sacred Scripture as well as longer and more difficult texts that are not suitable for inclusion in the Mass. The New Testament as a whole is read each year, partly in the Mass, partly in the liturgy of the hours; but for the Old Testament books a selection has been made of those parts that are of greater importance for the understanding of the history of salvation and for deepening devotion.
The complementarity between the readings in the liturgy of the hours and in the Mass in no way assigns the same texts to the same days or spreads the same books over the same seasons. This would leave the liturgy of the hours with the less important passages and upset the sequence of texts. Rather this complementarity necessarily demands that the same book be used in the Mass and in the liturgy of the hours in alternate years or that, if it is read in the same year, there be some interval in between.
150. During Lent the readings for the first year are passages from Deuteronomy and the Letter to the Hebrews. Those for the second year review the history of salvation from Exodus, Leviticus, and Numbers. The Letter to the Hebrews interprets the Old Covenant in the light of the paschal mystery of Christ. A passage from the same letter, on Christ’s sacrifice (Heb 9:11-28), is read on Good Friday; another, on the Lord’s rest (Heb 4:1-16), is read on Holy Saturday. On the other days of Holy Week the readings in Year I are the third and fourth Songs of the Servant of the Lord and extracts from Lamentations; in Year II the prophet Jeremiah is read, as a type of Christ in his passion.
152. From the Monday after the feast of the Baptism of the Lord until Lent and from the Monday after Pentecost until Advent there is a continuous series of thirty-four weeks in Ordinary Time.
This series is interrupted from Ash Wednesday until Pentecost. On the Monday after Pentecost Sunday the cycle of readings in Ordinary Time is resumed, beginning with the week after the one interrupted because of Lent; the reading assigned to the Sunday is omitted.
In years with only thirty-three weeks in Ordinary Time, the week immediately following Pentecost is dropped, in order to retain the readings of the last weeks which are eschatological readings.
The books of the Old Testament are arranged so as to follow the history of salvation: God reveals himself in the history of his people as he leads and enlightens them in progressive stages. This is why prophetic books are read along with the historical books, but with due consideration of the period in which the prophets lived and taught. Hence, the cycle of readings from the Old Testament contains, in Year I, the historical books and prophetic utterances from the Book of Joshua as far as, and including, the time of the exile. In Year II, after the readings from Genesis (read before Lent), the history of salvation is resumed after the exile up to the time of the Maccabees. Year II includes the later prophets, the wisdom literature, and the narratives in Esther, Tobit, and Judith.
The letters of the apostles not read at special times are distributed through the year in a way that takes into account the readings at Mass and the chronological order in which these letters were written.
153. The one-year cycle is shortened in such a way that each year special passages from sacred Scripture are read, but in correlation with the two-year cycle of readings at Mass, to which it is intended to be complementary.
154. Proper readings are assigned for solemnities and feasts; otherwise the readings are taken from the respective Common of Saints.
155. As far as possible, each passage read keeps to a certain unity. In order therefore to strike a balance in length (otherwise difficult to achieve in view of the different literary genres of the books), some verses are occasionally omitted, though omissions are always noted. But it is permissible and commendable to read the complete passage from an approved text.
156. The short readings or “chapters” (capitula) are referred to in no. 45, which describes their importance in the liturgy of the hours. They have been chosen to give clear and concise expression to a theme or an exhortation. Care has also been taken to ensure variety.
157. Accordingly, four weekly series of short readings have been composed for Ordinary Time. They are incorporated into the psalter in such a way that the reading changes during the four weeks. There are also weekly series for the seasons of Advent, Christmas, Lent, and Easter, In addition there are proper short readings for solemnities, feasts, and some memorials, as well as a one-week series for night prayer.
159. In keeping with the tradition of the Roman Church the office of readings has, after the biblical reading, a reading from the Fathers or church writers, with a responsory, unless there is to be a reading relating to a saint (see nos. 228-239).
160. Texts for this reading are given from the writings of the Fathers and doctors of the Church and from other ecclesiastical writers of the Eastern and Western Church. Pride of place is given to the Fathers because of their distinctive authority in the Church.
161. In addition to the readings that The Liturgy of the Hours assigns to each day, the optional lectionary supplies a larger collection, in order that the treasures of the Church’s tradition may be more widely available to those who pray the liturgy of the hours. Everyone is free to take the second reading either from The Liturgy of the Hours or from the optional lectionary.
162. Further the conferences of bishops may prepare additional texts adapted to the traditions and culture of their own region,  for inclusion in the optional lectionary as a supplement. These texts are to be taken from the works of Catholic writers, outstanding for their teaching and holiness of life.
164. By constant use of the writings handed down by the universal tradition of the Church, those who read them are led to a deeper reflection on sacred Scripture and to a relish and love for it. The writings of the Fathers are an outstanding witness to the contemplation of the word of God over the centuries by the Bride of the incarnate Word: the Church, “possessing the counsel and spirit of its Bridegroom and God,”  is always seeking to attain a more profound understanding of the sacred Scriptures.
165. The reading of the Fathers leads Christians to an understanding also of the liturgical seasons and feasts. In addition, it gives them access to the priceless spiritual treasures that form the unique patrimony of the Church and provide a firm foundation for the spiritual life and a rich source for increasing devotion. Preachers of God’s word also have at hand each day superb examples of sacred preaching.
166. The “hagiographical” readings or readings in honor of saints are either texts from a Father of the Church or another ecclesiastical writer, referring specifically or rightly applicable to the saint being commemorated, or the readings are texts from the saint’s own writings, or are biographical.
167. Those who compose particular propers for saints must ensure historical accuracy  as well as genuine spiritual benefit for those who will read or hear the readings about the saints. Anything that merely excites amazement should be carefully avoided. Emphasis should be given to the individual spiritual characteristics of the saints, in a way suited to modern conditions; stress should also be laid on their contribution to the life and spirituality of the Church.
168. A short biographical note, simply giving historical facts and a brief sketch of the saint’s life, is provided at the head of the reading. This is for information only and is not for reading aloud.
169. Its responsory follows the biblical reading in the office of readings. The text of this responsory has been drawn from traditional sources or freshly composed, in order to throw new light on the passage just read, put it in the context of the history of salvation, lead from the Old Testament to the New, turn what has been read into prayer and contemplation, or provide pleasant variety by its poetic beauty.
170. A pertinent responsory also follows the second reading. It is less closely linked with the text of the reading, however, and thus makes for a greater freedom in meditation.
171. The responsories and the portions to be repeated even in private recitation therefore retain their value. The customary reprise of the whole responsory may be omitted when the office is not being sung, unless the sense requires this repetition.
172. In a similar but simpler way, the responsory at morning prayer, evening prayer, and night prayer (see nos. 49 and 89), and the verse at daytime prayer, are linked to the short reading as a kind of acclamation, enabling God’s word to enter more deeply into the mind and heart of the one listening or reading.
173. A very ancient tradition gives hymns the place in the office that they still retain.  By their mystical and poetic character they are specifically designed for God’s praise. But they also are an element for the people; in fact more often than the other parts of the office the hymns bring out the proper theme of individual hours or feasts and incline and draw the spirit to a devout celebration. The beauty of their language often adds to this power. Furthermore, in the office hymns are the main poetic element created by the Church.
174. A hymn follows the traditional rule of ending with a doxology, usually addressed to the same divine person as the hymn itself.
175. In the office for Ordinary Time, to ensure variety, a twofold cycle of hymns i~ given for each hour, for use in alternate weeks.
176. In addition, a twofold cycle of hymns has been introduced into the office of readings for Ordinary Time, one for use at night and the other for use during the day.
177. New hymns can be set to traditional melodies of the same rhythm and meter.
178. For vernacular celebration, the conferences of bishops may adapt the Latin hymns to suit the character of their own language and introduce fresh compositions,  provided these are in complete harmony with the spirit of the hour, season, or feast. Great care must be taken not to allow popular songs that have no artistic merit and are not in keeping with the dignity of the liturgy.
180. The general intercessions, restored in the Mass of the Roman Rite, have their place also at evening prayer, though in a different fashion, as will be explained later.
181. Since traditionally morning prayer puts the whole day in God’s hands, there are invocations at morning prayer for the purpose of commending or consecrating the day to God.
182. The word preces covers both the intercessions at evening prayer and the invocations for dedicating the day to God at morning prayer.
183. In the interest of variety and especially of giving fuller expression to the many needs of the Church and of all people in relation to different states of life, groups, persons, circumstances, and seasons, different intercessory formularies are given for each day of the four-week psalter in Ordinary Time and for the special seasons of the liturgical year, as well as for certain feasts.
184. In addition, the conferences of bishops have the right to adapt the formularies given in the book of the liturgy of the hours and also to approve new ones,  in accordance with the norms that follow.
185. As in the Lord’s Prayer, petitions should be linked with praise of God and acknowledgment of his glory or with a reference to the history of salvation.
186. In the intercessions at evening prayer the last intention is always for the dead.
187. Since the liturgy of the hours is above all the prayer of the whole Church for the whole Church, indeed for the salvation of the whole world,  universal intentions should take precedence over all others, namely, for: the Church and its ministers; secular authorities; the poor, the sick, and the sorrowful; the needs of the whole world, that is, peace and other intentions of this kind.
188. It is permissible, however, to include particular intentions at both morning prayer and evening prayer.
189. The intercessions in the office are so arranged that they can be adapted for celebration with a congregation or in a small community or for private recitation.
190. The intercessions in a celebration with a congregation or in common are thus introduced by a brief invitation, given by the priest or minister and designating the single response that the congregation is to repeat after each petition.
191. Further, the intentions are phrased as direct addresses to God and thus are suitable for both common celebration and private recitation.
192. Each intention consists of two parts; the second may be used as an alternative response.
193. Different methods can therefore be used for the intercessions. The priest or minister may say both parts of the intention and the congregation respond with a uniform response or a silent pause, or the priest or minister may say only the first part of the intention and the congregation respond with the second part.
194. In accord with ancient tradition, the Lord’s Prayer has a place suited to its dignity, namely, after the intercessions at morning prayer and evening prayer, the hours most often celebrated with the people.
195. Henceforth, therefore, the Lord’s Prayer will be said with solemnity on three occasions during the day: at Mass, at morning prayer, and at evening prayer.
196. The Lord’s Prayer is said by all after a brief introduction, if this seems opportune.
198. In the office of readings, this prayer is as a rule the prayer proper to the day. At night prayer, the prayer is always the prayer given in the psalter for that hour.
199. The concluding prayer at morning prayer and evening prayer is taken from the proper on Sundays, on the weekdays of the seasons of Advent, Christmas, Lent, and Easter, and on solemnities, feasts, and memorials. On weekdays in Ordinary Time the prayer is the one given in the four-week psalter to express the character of these two hours.
200. The concluding prayer at daytime prayer is taken from the proper on Sundays, on the weekdays of the seasons of Advent, Christmas, Lent, and Easter, and on solemnities and feasts. On other days the prayers are those that express the character of the particular hour. These are given in the four-week psalter.
201. It is a general principle that care should be taken in liturgical services to see that “at the proper times all observe a reverent silence.”  An opportunity for silence should therefore be provided in the celebration of the liturgy of the hours.
202. In order to receive in our hearts the full sound of the voice of the Holy Spirit and to unite our personal prayer more closely with the word of God and the public voice of the Church, it is permissible, as occasion offers and prudence suggests, to have an interval of silence. It may come either after the repetition of the antiphon at the end of the psalm, in the traditional way, especially if the psalm-prayer is to be said after the pause (see no. 112), or after the short or longer readings, either before or after the responsory.
Care must be taken to avoid the kind of silence that would disturb the structure of the office or annoy and weary those taking part.
203. In individual recitation there is even greater freedom to pause in meditation on some text that moves the spirit; the office does not on this account lose its public character.
204. The office of Sunday begins with evening prayer I, which is taken entirely from the four-week psalter, except those parts that are marked as proper.
205. When a feast of the Lord is celebrated on Sunday, it has a proper evening prayer I.
206. The way to celebrate Sunday vigils, as circumstances suggest, has been discussed in no. 73.
208. For the Easter triduum the office is celebrated in the way set forth in the Proper of Seasons.
209. Those who take part in the evening Mass of the Lord’s Supper or the celebration of the Lord’s passion on Good Friday do not say evening prayer on either day.
210. On Good Friday and Holy Saturday the office of readings should be celebrated publicly with the people before morning prayer, as far as this is possible.
211. Night prayer for Holy Saturday is said only by those who are not present at the Easter Vigil.
212. The Easter Vigil takes the place of the office of readings. Those not present at the solemn celebration of the Vigil should therefore read at least four of its readings with the chants and prayers. It is desirable that these be the readings from Exodus, Ezekiel, St. Paul, and from the Gospel. The Te Deum follows, then the prayer of the day.
213. Morning prayer for Easter Sunday is said by all. It is fitting that evening prayer be celebrated in a more solemn way to mark the ending of so holy a day and to commemorate the occasions when the Lord showed himself to his disciples. Great care should be taken to maintain, where it exists, the particular tradition of celebrating evening prayer on Easter Sunday in honor of baptism. During this there is a procession to the font as the psalms are being sung.
214. The liturgy of the hours takes on a paschal character from the acclamation, Alleluia that concludes most antiphons (see no. 120), from the hymns, antiphons, and special intercessions, and from the proper readings assigned to each hour.
215. On Christmas eve it is fitting that by means of the office of readings, a solemn vigil be celebrated before Mass. Night prayer is not said by those present at this vigil.
216. Morning prayer on Christmas Day is said as a rule before the Mass at Dawn.
217. In arranging the office for solemnities and feasts of the Lord, what is said in nos. 225-233 should be observed, with any necessary changes.
218. The celebrations of the saints are arranged so that they do not take precedence over those feast days and special seasons that commemorate the mysteries of salvation.  Nor are they allowed to break up the sequence of psalms and biblical readings or to give rise to undue repetitions. At the same time, the plan makes proper provision for the rightful honoring of the individual saints. These principles form the basis for the reform of the calendar, carried out by order of Vatican Council II, and for the plan for celebrating the saints in the liturgy of the hours that is described in the following paragraphs.
219. Celebrations in honor of the saints are either solemnities, feasts, or memorials.
220. Memorials are either obligatory memorials or, when not so classified, optional memorials. In deciding on the merits of celebrating an optional memorial in an office to be celebrated with the people or in common, account should be taken of the general good or of the genuine devotion of the congregation, not simply that of the person presiding.
221. When more than one optional memorial falls on the same day, only one may be celebrated; the rest are omitted.
222. Only solemnities are transferred, in accordance with the rubrics.
223. The norms that follow apply to the saints entered in the General Roman Calendar and to those with a place in particular calendars.
224. Where proper parts are not given, they are supplied from the respective Common of Saints.
225. Solemnities have an evening prayer I on the preceding day.
226. At evening prayer I and II, the hymn, the antiphons, the short reading with its responsory, and the concluding prayer are proper. Where anything proper is missing, it is supplied from the common.
In keeping with an ancient tradition, at evening prayer I both psalms are as a rule taken from the Laudate Psalms (Ps 113, 117, 135, 146, 147 A, 147 B). The New Testament canticle is noted in its appropriate place. At evening prayer II the psalms and canticles are proper; the intercessions are either proper or from the common.
227. At morning prayer, the hymn, the antiphons, the short reading with its responsory, and the concluding prayer are proper. Where anything proper is missing, it is supplied from the common. The psalms are to be taken from the Sunday of Week I of the four-week psalter; the intercessions are either proper or from the common.
228. In the office of readings, everything is proper: the hymn, the antiphons and psalms, the readings and the responsories. The first reading is from Scripture; the second is about the saint. In the case of a saint with a purely local cult and without special texts even in the local proper, everything is taken from the common.
At the end of the office of readings the Te Deum and the proper prayer are said.
229. At daytime prayer, the hymn of the weekday is used, unless other directions are given. The psalms are from the Gradual Psalms with a proper antiphon. On Sundays the psalms are taken from the Sunday of Week I of the four-week psalter and the short reading and concluding prayer are proper. But on certain solemnities of the Lord there are special psalms.
230. At night prayer, everything is said as on Sundays, after evening prayer I and II respectively.
231. Feasts have no evening prayer I, except those feasts of the Lord that fall on a Sunday. At the office of readings, at morning prayer, and at evening prayer, all is done as on solemnities.
232. At daytime prayer, the hymn of the weekday is used. The weekday psalms with their antiphons are said, unless a special reason or tradition requires a proper antiphon; this will be indicated as the case occurs. The reading and concluding prayer are proper.
233. Night prayer is said as on ordinary days.
234. In the arrangement of the office there is no difference between obligatory and optional memorials, except in the case of optional memorials falling during privileged seasons.
d. in the office of readings, the Scripture reading with its responsory is from the current cycle. The second reading is about the saint, with a proper responsory or one taken from the common; if there is no proper reading, the patristic reading for the day is used. The Te Deum is not said.
236. At daytime prayer and night prayer, all is from the weekday and nothing is from the office of the saint.
237. On Sundays, solemnities, and feasts, on Ash Wednesday, during Holy Week, and during the octave of Easter, memorials that happen to fall on these days are disregarded.
238. On the weekdays from 17 to 24 December, during the octave of Christmas, and on the weekdays of Lent, no obligatory memorials are celebrated, even in particular calendars. When any happen to fall during Lent in a given year, they are treated as optional memorials.
b. at morning prayer and evening prayer, the ending of the concluding prayer may be omitted and the saint’s antiphon (from the proper or common) and prayer may be added.
240. On Saturdays in Ordinary Time, when optional memorials are permitted, an optional memorial of the Blessed Virgin Mary may be celebrated in the same way as other memorials, with its own proper reading.
244. On weekdays when an optional memorial is permitted, for a good reason the office of a saint listed on that day in the Roman Martyrology, or in an approved appendix to it, may be celebrated in the same way as other memorials (see nos. 234-239).
245. For a public cause or out of devotion, except on solemnities, the Sundays of the seasons of Advent, Lent, and Easter, Ash Wednesday, Holy Week, the octave of Easter, and 2 November, a votive office may be celebrated, in whole or in part: for example, on the occasion of a pilgrimage, a local feast, or the external solemnity of a saint.
246. In certain particular cases there is an option to choose texts different from those given for the day, provided there is no distortion of the general arrangement of each hour and the rules that follow are respected.
247. In the office for Sundays, solemnities, feasts of the Lord listed in the General Calendar, the weekdays of Lent and Holy Week, the days within the octaves of Easter and Christmas, and the weekdays from 17 to 24 December inclusive, it is never permissible to change the formularies that are proper or adapted to the celebration, such as antiphons, hymns, readings, responsories, prayers, and very often also the psalms.
In place of the Sunday psalms of the current week, there is an option to substitute the Sunday psalms of a different week, and, in the case of an office celebrated with a congregation, even other psalms especially chosen to lead the people step by step to an understanding of the psalms.
248. In the office of readings, the current cycle of sacred Scripture must always be respected. The Church’s intent that “a more representative portion of the holy Scriptures will be read to the people in the course of a prescribed number of years”  applies also to the divine office.
Therefore the cycle of readings from Scripture that is provided in the office of readings must not be set aside during the seasons of Advent, Christmas, Lent, and Easter. During Ordinary Time, however, on a particular day or for a few days in succession, it is permissible, for a good reason, to choose readings from those provided on other days or even other biblical readings – for example, on the occasion of retreats, pastoral gatherings, prayers for Christian unity, or other such events.
249. When the continuous reading is interrupted because of a solemnity or feast or special celebration, it is allowed during the same week, taking into account the readings for the whole week, either to combine the parts omitted with others or to decide which of the texts are to be preferred.
250. The office of readings also offers the option to choose, with a good reason, another reading from the same season, taken from The Liturgy of the Hours or the optional lectionary (no. 161), in preference to the second reading appointed for the day. On weekdays in Ordinary Time and, if it seems opportune, even in the seasons of Advent, Christmas, Lent, and Easter, the choice is open for a semicontinuous reading of the work of a Father of the Church, in harmony with the biblical and liturgical context.
251. The readings, prayers, songs, and intercessions appointed for the weekdays of a particular season may be used on other weekdays of the same season.
252. Everyone should be concerned to respect the complete cycle of the four-week psalter.  Still, for spiritual or pastoral advantage, the psalms appointed for a particular day may be replaced with others from the same hour of a different day. There are also circumstances occasionally arising when it is permissible to choose suitable psalms and other texts in the way done for a votive office.
254. When a bishop presides, especially in the cathedral, he should be attended by his college of priests and by ministers and the people should take a full and active part. A priest or deacon should normally preside at every celebration with a congregation and ministers should also be present.
255. The priest or deacon who presides at a celebration may wear a stole over the alb or surplice; a priest may also wear a cope. On greater solemnities the wearing of the cope by many priests or of the dalmatic by many deacons is permitted.
256. It belongs to the presiding priest or deacon, at the chair, to open the celebration with the introductory verse, begin the Lord’s Prayer, say the concluding prayer, greet the people, bless them, and dismiss them.
257. Either the priest or a minister may lead the intercessions.
258. In the absence of a priest or deacon, the one who presides at the office is only one among equals and does not enter the sanctuary or greet and bless the people.
259. Those who act as readers, standing in a convenient place, read either the long readings or the short readings.
260, A cantor or cantors should intone the antiphons, psalms, and other chants. With regard to the psalmody, the directions of nos. 121-125 should be followed.
261. During the gospel canticle at morning prayer and evening prayer there may be an incensation of the altar, then of the priest and congregation.
262. The choral obligation applies to the community, not to the place of celebration, which need not be a church, especially in the case of those hours that are celebrated without solemnity.
d. the intercessions, the Lord’s Prayer, and the concluding prayer.
264. All sit to listen to the readings, except the gospel.
265. The assembly either sits or stands, depending on custom, while the psalms and other canticles (with their antiphons) are being said.
b. the beginning of the gospel, the Canticles of Zechariah, of Mary, and of Simeon. The sign of the cross is made on the mouth at the beginning of the invitatory, at Lord, open my lips.
267. In the rubrics and norms of this Instruction, the words “say .. .. recite,” etc., are to be understood to refer to either singing or recitation, in the light of the principles that follow.
269. The declarations of Vatican Council II on liturgical singing apply to all liturgical services but in a special way to the liturgy of the hours.  Though every part of it has been revised in such a way that all may be fruitfully recited even by individuals, many of these parts are lyrical in form and do not yield their fuller meaning unless they are sung, especially the psalms, canticles, hymns, and responsories.
270. Hence, in celebrating the liturgy singing is not to be regarded as an embellishment superimposed on prayer; rather, it wells up from the depths of a soul intent on prayer and the praise of God and reveals in a full and complete way the community nature of Christian worship.
Christian communities of all kinds seeking to use this form of prayer as frequently as possible are to be commended. Clerics and religious, as well as all the people of God, must be trained by suitable catechesis and practice to join together in singing the hours in a spirit of joy, especially on Sundays and holydays. But it is no easy task to sing the entire office; nor is the Church’s praise to be considered either by origin or by nature the exclusive possession of clerics and monks but the property of the whole Christian community. Therefore several principles must be kept simultaneously in mind if the sung celebration of the liturgy of the hours is to be performed correctly and to stand out in its true nature and splendor.
271. It is particularly appropriate that there be singing at least on Sundays and holydays, so that the different degrees of solemnity will thus come to be recognized.
272. It is the same with the hours: all are not of equal importance; thus it is desirable that those that are the true hinges of the office, that is, morning prayer and evening prayer, should receive greater prominence through the use of singing.
274. For liturgical celebrations sung in Latin, Gregorian chant, as the music proper to the Roman liturgy, should have pride of place, all other things being equal.  Nevertheless, “the Church does not exclude any type of sacred music from liturgical services as long as the music matches the spirit of the service itself and the character of the individual parts and is not a hindrance to the required active participation of the people.” At a sung office, if a melody is not available for the given antiphon, another antiphon should be taken from those in the repertoire, provided it is suitable in terms of nos. 113 and 121-125.
278. Clearly the psalms are closely bound up with music (see nos. 103-120), as both Jewish and Christian tradition confirm. In fact a complete understanding of many of the psalms is greatly assisted by singing them or at least not losing sight of their poetic and musical character. Accordingly, whenever possible singing the psalms should have preference, at least for the major days and hours and in view of the character of the psalms themselves.
279. The different ways of reciting the psalms have been described in nos. 121-123. Varying these ways should depend not so much on external circumstances as on the different genres of the psalms to be recited in the same celebration. Thus the wisdom psalms and the narrative psalms are perhaps better listened to, whereas psalms of praise and thanksgiving are of their nature designed for singing in common. The main consideration is to ensure that the celebration is not too inflexible or elaborate nor concerned merely with formal observance of rules, but that it matches the reality of what is celebrated. The primary aim must be to inspire hearts with a desire for genuine prayer and to show that the celebration of God’s praise is a thing of joy (see Ps 147).
280. Even when the hours are recited, hymns can nourish prayer, provided they have doctrinal and literary excellence; but of their nature they are designed for singing and so, as far as possible, at a celebration in common they should be sung.
281. The short responsory after the reading at morning prayer and evening prayer (see no. 49) is of its nature designed for singing and indeed for congregational singing.
282. The responsories following the readings in the office of readings by their very nature and function also call for their being sung. In the plan of the office, however, they are composed in such a way that they retain their power even in individual and private recitation. Responsories set to simpler melodies can be sung more frequently than those responsories drawn from the traditional liturgical books.
283. The longer readings and the short readings are not of themselves designed for singing. When they are proclaimed, great care should be taken that the reading is dignified, clear, and distinct and that it is really audible and fully intelligible for all. The only acceptable melody for a reading is therefore one that best ensures the hearing of the words and the understanding of the text.
284. Texts that are said only by the person presiding, such as the concluding prayer, can be sung gracefully and appropriately, especially in Latin. This, however, will be more difficult in some languages, unless singing makes the texts more clearly audible for all.
See Acts 1:14, 4:24, 12:5 and 12. See also Eph 5:19-21.
See Mt 14:19, 15:36; Mk 6:41, 8:7; Lk 9:16; Jn 6:11.
See Mt 11:25.ff; Lk 10:21ff.
See Mk 1:35, 6:46; Lk 5:16. See also Mt 4:1 and par.; Mt 14:23.
See Mt 14:23 and 25; Mk 6:46 and 48.
See Mt 21:13 and par.
See Mt 14:19 and par.; Mt 15:36 and par.
See Mt 26:26 and par.
See Mt 26:30 and par.
See Mt 26:36-44 and par.
See Lk 23:34 and 46; Mt 27:46; Mk 15:34.
Mt 5:44, 7:7, 26:41; Mk 13:33, 14:38; Lk 6:28, 10:2, 11:9, 22:40 and 46.
Jn 14:13ff., 15:16, 16:23ff. and 26.
See Mt 6:9-13; Lk 11:2-4.
See Lk 21:36; Mk 13:33.
See Lk 11:5-13,18:1-8; Jn 14:13, 16:23.
See Mt 6:5-8, 23:14; Lk 20:47; Jn 4:23.
See Rom 8:15 and 26; 1 Cor 12:3; Gal 4:6; Jude 20.
See 2 Cor 1:20; Col 3:17.
See Rom 12:12; 1 Cor 7:5; Eph 6:18; Col 4:2; 1 Thes 5:17; 1 Tm 5:5; 1 Pt 4:7.
See 1 Tm 4:5; Jas 5:15ff.; 1 Jn 3:22, 5:14ff.
See Eph 5:19ff.; Heb 13:15; Rv 19:5.
See Col 3:17; Phil 4:6; 1 Thes 5:17; 1 Tm 2:1.
See Rom 8:26; Phil 4:6.
See Rom 15:30; 1 Tm 2:1ff.; Eph 6:18; 1 Thes 5:25; Jas 5:14 and 16.
See 1 Tm 2:5; Heb 8:6, 9:15, 12:24.
See Rom 5:2; Eph 2:18, 3:12.
Augustine, Enarrat. in Ps. 85, 1: CCL 39, 1176.
See Lk 10:21, the occasion when Jesus “rejoiced in the Holy Spirit and said: ‘I thank you, Father…'”.
See SC art. 83 and 98.
LG no. 50; SC art. 8 and 104.
See no. 24 of this Instruction.
See SC art. 90. Rule of St. Benedict ch. 19.
See PO no. 14; OT no. 8.
See art. 42. See also AA no. 10.
See SC art. 26 and 84.
See nos. 100-109 of this Instruction.
CD no. 33; see also PC nos. 6, 7, 15; AG no. 15.
See GE no. 2; AA no. 16.
See SC art. 41; LG no. 21.
See LG no. 26; CD no. 15.
See Jn 10:11, 17:20 and 23.
See DV no. 25; PO no. 13.
See Paul VI, Motu Proprio Sacram Diaconatus Ordinem, 18 June 1967, no. 27.
See SCR, Instr. InterOec no. 78b.
See SC art. 26, 28-30.
SC art. 89a; see also art. 100.
Basil the Great, Regulae fusius tractatae resp. 37, 3: PG 31, 1014.
Cyprian, De oratione dominica 35: PL 4, 561.
Basil the Great, Regulae fusius tractatae resp. 37, 3: PG 31, 1015.
John Cassian, De institutione coenob. 3, 3: PL 49, 124, 125.
Cyprian, De oratione dominica 35: PL 4, 560.
RP, Ordination of Priests no. 14.
Ambrose, De officiis ministrorum 1, 20, 88: PL 16, 50. See also DV no. 25.
Augustine, Sermo Guelferbytanus 5: PL Suppl 2, 550.
Ibid.: PL Suppl 2, 552.
Rule of St. Benedict ch. 19.
See Rule of St. Benedict ch. 19.
Gregory the Great, Homilia 34 in Evangelia: PL 76: 1282.
Vincent of Lerins, Commonitorium 2: PL 50, 640.
Bernard of Clairvaux, Sermo 3 in vigilia Nativitatis 1: PL 183 (ed. 1879) 94.
Thus, for example, John Chrysostom, In Epist. ad Tim 1, Homilia 6: PG 62, 530.
See SC art. 83 and 89.
See no. 256 of this Instruction.
See General Norms for the Liturgical Year and the Calendar no. 52.
See ibid. Table of Liturgical Days nos. 4 and 8.
SCR, Instr. MusSacr, 5 March 1967, no. 37. See also SC art. 99.
SCR, Instr. MusSacr no. 9. See also SC art. 116.
SCR, Instr. MusSacr no. 41; see also nos. 54-61.
See ibid. nos. 16a and 38.

References: art. 83
 art. 8
 art. 90
 art. 42
 art. 26
 art. 41
 art. 26
 art. 89
 art. 100
 art. 83
 art. 99
 art. 116