Source: https://rorate-caeli.blogspot.com/2007/07/apostolic-letter-summorum-pontificum-of.html
Timestamp: 2019-04-26 13:57:17+00:00

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Many other Roman pontiffs, in the course of the centuries, showed particular solicitude in ensuring that the sacred liturgy accomplished this task more effectively. Outstanding among them is Saint Pius V who, sustained by great pastoral zeal and following the exhortations of the Council of Trent, renewed the entire liturgy of the Church, oversaw the publication of liturgical books amended and 'renewed in accordance with the norms of the Fathers,' and provided them for the use of the Latin Church.
'It was towards this same goal that succeeding Roman Pontiffs directed their energies during the subsequent centuries in order to ensure that the rites and liturgical books were brought up to date and when necessary clarified. From the beginning of this century they undertook a more general reform.' (2) Thus acted also our predecessors Clement VIII, Urban VIII, Saint Pius X (3), Benedict XV, Pius XII and Blessed John XXIII.
But in some regions, no small numbers of faithful adhered and continue to adhere with great love and affection to the earlier liturgical forms. These had so deeply marked their culture and their spirit that in 1984 the Supreme Pontiff John Paul II, moved by a concern for the pastoral care of these faithful, with the special indult “Quattuor abhinc annos”, issued by the Congregation for Divine Worship, granted permission to use the Roman Missal published by Blessed John XXIII in the year 1962. Later, in the year 1988, John Paul II with the Apostolic Letter given Motu Proprio, “Ecclesia Dei”, exhorted bishops to make generous use of this power in favor of all the faithful who so desired.
Art. 1 The Roman Missal promulgated by Paul VI is the ordinary expression of the Lex orandi [Law of prayer] of the Catholic Church of the Latin rite. Nonetheless, the Roman Missal promulgated by St. Pius V and reissued by Bl. John XXIII is to be considered as an extraordinary expression of that same Lex orandi, and must be given due honour for its venerable and ancient usage. These two expressions of the Church’s Lex orandi will in no any way lead to a division in the Church’s Lex credendi [Law of belief]. They are, in fact two uses of the one Roman rite.
Art. 2 In Masses celebrated without the people, each Catholic priest of the Latin rite, whether secular or regular, may use the Roman Missal published by Bl. Pope John XXIII in 1962, or the Roman Missal promulgated by Pope Paul VI in 1970, and may do so on any day with the exception of the Easter Triduum. For such celebrations, with either one Missal or the other, the priest has no need for permission from the Apostolic See or from his Ordinary.
Art. 3 Communities of Institutes of consecrated life and of Societies of apostolic life, of either pontifical or diocesan right, wishing to celebrate Mass in accordance with the edition of the Roman Missal promulgated in 1962, for conventual or “community” celebration in their oratories, may do so. If an individual community or an entire Institute or Society wishes to undertake such celebrations often, habitually or permanently, the decision must be taken by the Superiors Major, in accordance with the law and following their own specific decrees and statutes.
Art. 4 Celebrations of Mass as mentioned above in art. 2 may – observing all the norms of law – also be attended by faithful who, of their own free will, ask to be admitted.
Art. 5 § 1 In parishes, where there is a group of faithful who stably adhere to the earlier liturgical tradition, the pastor should willingly accept their requests to celebrate the Mass according to the rite of the Roman Missal published in 1962, and ensure that the welfare of these faithful harmonises with the ordinary pastoral care of the parish, under the guidance of the bishop in accordance with canon 392, avoiding discord and favouring the unity of the whole Church.
§ 2 Celebration according to the Missal of Bl. John XXIII may take place on working days; while on Sundays and feast days one such celebration may also be held.
§ 4 Priests who use the Missal of Bl. John XXIII must be idoneous and not juridically impeded.
Art. 6 In Masses celebrated in the presence of the people in accordance with the Missal of Bl. John XXIII, the readings may be given in the vernacular, using editions recognised by the Apostolic See.
Art. 7 If a group of lay faithful, as mentioned in art. 5 § 1, has not obtained satisfaction to their requests from the pastor, they should inform the diocesan bishop. The bishop is strongly requested to satisfy their wishes. If he does not want to arrange for such celebration to take place, the matter should be referred to the Pontifical Commission “Ecclesia Dei”.
Art. 8 A bishop who, desirous of satisfying such requests, but who for various reasons is unable to do so, may refer the problem to the Commission “Ecclesia Dei” to obtain counsel and assistance.
Art. 9 § 1 The pastor, having attentively examined all aspects, may also grant permission to use the earlier ritual for the administration of the Sacraments of Baptism, Marriage, Penance, and the Anointing of the Sick, if the good of souls would seem to require it.
§ 3 Clerics ordained “in sacris constitutis” may use the Roman Breviary promulgated by Bl. John XXIII in 1962.
Art. 10 The ordinary of a particular place, if he deems it appropriate, may erect a personal parish in accordance with can. 518 for celebrations following the ancient form of the Roman rite, or appoint a chaplain, while observing all the norms of law.
Art. 11 The Pontifical Commission “Ecclesia Dei” (5) , erected by John Paul II in 1988, continues to exercise its function. Said Commission will have the form, duties and norms that the Roman Pontiff wishes to assign it.
Art. 12 This Commission, apart from the powers it enjoys, will exercise the authority of the Holy See, supervising the observance and application of these dispositions.
We order that everything We have decreed with this Apostolic Letter given Motu Proprio be considered as having full and lasting force, and be observed from September 14 of this year, Feast of the Exaltation of the Holy Cross, notwithstanding any provisions to the contrary.
Given in Rome, at Saint Peter’s, on July 7, in the year of Our Lord 2007, the third of Our Pontificate.
1. General Instruction of the Roman Missal, 3rd ed., 2002, no. 397.
2. John Paul II, Apostolic Letter "Vicesimus quintus annus," 4 December 1988, 3: AAS 81 (1989), 899.
4. St. Pius X, Apostolic Letter Motu propio data, "Abhinc duos annos," 23 October 1913: AAS 5 (1913), 449-450; cf John Paul II, Apostolic Letter "Vicesimus quintus annus," no. 3: AAS 81 (1989), 899.
5. Cf John Paul II, Apostolic Letter Motu proprio data "Ecclesia Dei," 2 July 1988, 6: AAS 80 (1988), 1498.
Official publication: AAS 99 (2007), 777-781.

References: Art. 1

Art. 2

Art. 3

Art. 4
 art. 2

Art. 5
 § 1

§ 2

§ 4

Art. 6

Art. 7
 art. 5
 § 1

Art. 8

Art. 9
 § 1

§ 3

Art. 10

Art. 11

Art. 12