WatsonOverHere/Summa_Theologica huggingface dataset:
Q: Whether the Mass of a Sinful Priest Is of Less Worth Than the Mass of a Good Priest?

A: On the contrary,
It is stated in Decretal i, q. 1: "The worthier the priest, the sooner is he heard in the needs for which he prays."

I answer that,
There are two things to be considered in the mass. namely, the sacrament itself, which is the chief thing; and the prayers which are offered up in the mass for the quick and the dead. So far as the mass itself is concerned, the mass of a wicked priest is not of less value than that of a good priest, because the same sacrifice is offered by both.

Again, the prayer put up in the mass can be considered in two respects: first of all, in so far as it has its efficacy from the devotion of the priest interceding, and in this respect there is no doubt but that the mass of the better priest is the more fruitful. In another respect, inasmuch as the prayer is said by the priest in the mass in the place of the entire Church, of which the priest is the minister; and this ministry remains even in sinful men, as was said above (A. 5) in regard to Christ's ministry. Hence, in this respect the prayer even of the sinful priest is fruitful, not only that which he utters in the mass, but likewise all those he recites in the ecclesiastical offices, wherein he takes the place of the Church. on the other hand, his private prayers are not fruitful, according to Prov. 28:9: "He that turneth away his ears from hearing the law, his prayer shall be an abomination."

Reply Obj. 1: Gregory is speaking there of the holiness of the Divine sacrament.

Reply Obj. 2: In the sacrament of Baptism solemn prayers are not made for all the faithful, as in the mass; therefore there is no parallel in this respect. There is, however, a resemblance as to the effect of the sacrament.

Reply Obj. 3: By reason of the power of the Holy Ghost, Who communicates to each one the blessings of Christ's members on account of their being united in charity, the private blessing in the mass of a good priest is fruitful to others. But the private evil of one man cannot hurt another, except the latter, in some way, consent, as Augustine says (Contra Parmen. ii).
Q: Objection 1: It seems that the mass of a sinful priest is not of less worth than that of a good priest. For Pope Gregory says in the Register: "Alas, into what a great snare they fall who believe that the Divine and hidden mysteries can be sanctified more by some than by others; since it is the one and the same Holy Ghost Who hallows those mysteries in a hidden and invisible manner." But these hidden mysteries are celebrated in the mass. Therefore the mass of a sinful priest is not of less value than the mass of a good priest.

Obj. 2: Further, as Baptism is conferred by a minister through the power of Christ Who baptizes, so likewise this sacrament is consecrated in the person of Christ. But Baptism is no better when conferred by a better priest, as was said above (Q. 64, A. 1, ad 2). Therefore neither is a mass the better, which is celebrated by a better priest.

Obj. 3: Further, as the merits of priests differ in the point of being good and better, so they likewise differ in the point of being good and bad. Consequently, if the mass of a better priest be itself better, it follows that the mass of a bad priest must be bad. Now this is unreasonable, because the malice of the ministers cannot affect Christ's mysteries, as Augustine says in his work on Baptism (Contra Donat. xii). Therefore neither is the mass of a better priest the better.
Q: Whether Heretics, Schismatics, and Excommunicated Persons Can Consecrate?

A: On the contrary,
Augustine says (Contra Parmen. ii): "Just as Baptism remains in them," i.e. in heretics, schismatics, and those who are excommunicate, "so do their orders remain intact." Now, by the power of his ordination, a priest can consecrate the Eucharist. Therefore, it seems that heretics, schismatics, and those who are excommunicate, can consecrate the Eucharist, since their orders remain entire.

I answer that,
Some have contended that heretics, schismatics, and the excommunicate, who are outside the pale of the Church, cannot perform this sacrament. But herein they are deceived, because, as Augustine says (Contra Parmen. ii), "it is one thing to lack something utterly, and another to have it improperly"; and in like fashion, "it is one thing not to bestow, and quite another to bestow, but not rightly." Accordingly, such as, being within the Church, received the power of consecrating the Eucharist through being ordained to the priesthood, have such power rightly indeed; but they use it improperly if afterwards they be separated from the Church by heresy, schism, or excommunication. But such as are ordained while separated from the Church, have neither the power rightly, nor do they use it rightly. But that in both cases they have the power, is clear from what Augustine says (Contra Parmen. ii), that when they return to the unity of the Church, they are not re-ordained, but are received in their orders. And since the consecration of the Eucharist is an act which follows the power of order, such persons as are separated from the Church by heresy, schism, or excommunication, can indeed consecrate the Eucharist, which on being consecrated by them contains Christ's true body and blood; but they act wrongly, and sin by doing so; and in consequence they do not receive the fruit of the sacrifice, which is a spiritual sacrifice.

Reply Obj. 1: Such and similar authorities are to be understood in this sense, that the sacrifice is offered wrongly outside the Church. Hence outside the Church there can be no spiritual sacrifice that is a true sacrifice with the truth of its fruit, although it be a true sacrifice with the truth of the sacrament; thus it was stated above (Q. 80, A. 3), that the sinner receives Christ's body sacramentally, but not spiritually.

Reply Obj. 2: Baptism alone is allowed to be conferred by heretics, and schismatics, because they can lawfully baptize in case of necessity; but in no case can they lawfully consecrate the Eucharist, or confer the other sacraments.

Reply Obj. 3: The priest, in reciting the prayers of the mass, speaks instead of the Church, in whose unity he remains; but in consecrating the sacrament he speaks as in the person of Christ, Whose place he holds by the power of his orders. Consequently, if a priest severed from the unity of the Church celebrates mass, not having lost the power of order, he consecrates Christ's true body and blood; but because he is severed from the unity of the Church, his prayers have no efficacy.
Q: Objection 1: It seems that heretics, schismatics, and excommunicated persons are not able to consecrate the Eucharist. For Augustine says (Liber sentent. Prosperi xv) that "there is no such thing as a true sacrifice outside the Catholic Church": and Pope Leo I says (Ep. lxxx; cf. Decretal i, q. 1): Elsewhere "(i.e. than in the Church which is Christ's body) there is neither valid priesthood nor true sacrifice." But heretics, schismatics, and excommunicated persons are severed from the Church. Therefore they are unable to offer a true sacrifice.

Obj. 2: Further (Decretal, caus. i, q. 1), Innocent I is quoted as saying: "Because we receive the laity of the Arians and other pestilential persons, if they seem to repent, it does not follow that their clergy have the dignity of the priesthood or of any other ministerial office, for we allow them to confer nothing save Baptism." But none can consecrate the Eucharist, unless he have the dignity of the priesthood. Therefore heretics and the like cannot consecrate the Eucharist.

Obj. 3: Further, it does not seem feasible for one outside the Church to act on behalf of the Church. But when the priest consecrates the Eucharist, he does so in the person of the entire Church, as is evident from the fact of his putting up all prayers in the person of the Church. Therefore, it seems that those who are outside the Church, such as those who are heretics, schismatics, and excommunicate, are not able to consecrate the Eucharist.
Q: Whether a Degraded Priest Can Consecrate This Sacrament?

A: On the contrary,
Augustine (Contra Parmen. ii) proves that "apostates" from the faith "are not deprived of their Baptism," from the fact that "it is not restored to them when they return repentant; and therefore it is deemed that it cannot be lost." But in like fashion, if the degraded man be restored, he has not to be ordained over again. Consequently, he has not lost the power of consecrating, and so the degraded priest can perform this sacrament.

I answer that,
The power of consecrating the Eucharist belongs to the character of the priestly order. But every character is indelible, because it is given with a kind of consecration, as was said above (Q. 63, A. 5), just as the consecrations of all other things are perpetual, and cannot be lost or repeated. Hence it is clear that the power of consecrating is not lost by degradation. For, again, Augustine says (Contra Parmen. ii): "Both are sacraments," namely Baptism and order, "and both are given to a man with a kind of consecration; the former, when he is baptized; the latter when he is ordained; and therefore it is not lawful for Catholics to repeat either of them." And thus it is evident that the degraded priest can perform this sacrament.

Reply Obj. 1: That Canon is speaking, not as by way of assertion, but by way of inquiry, as can be gleaned from the context.

Reply Obj. 2: The bishop gives the priestly power of order, not as though coming from himself, but instrumentally, as God's minister, and its effect cannot be taken away by man, according to Matt. 19:6: "What God hath joined together, let no man put asunder." And therefore the bishop cannot take this power away, just as neither can he who baptizes take away the baptismal character.

Reply Obj. 3: Excommunication is medicinal. And therefore the ministry of the priestly power is not taken away from the excommunicate, as it were, perpetually, but only for a time, that they may mend; but the exercise is withdrawn from the degraded, as though condemned perpetually.
Q: Objection 1: It seems that a degraded priest cannot consecrate this sacrament. For no one can perform this sacrament except he have the power of consecrating. But the priest "who has been degraded has no power of consecrating, although he has the power of baptizing" (App. Gratiani). Therefore it seems that a degraded priest cannot consecrate the Eucharist.

Obj. 2: Further, he who gives can take away. But the bishop in ordaining gives to the priest the power of consecrating. Therefore he can take it away by degrading him.

Obj. 3: Further, the priest, by degradation, loses either the power of consecrating, or the use of such power. But he does not lose merely the use, for thus the degraded one would lose no more than one excommunicated, who also lacks the use. Therefore it seems that he loses the power to consecrate, and in consequence that he cannot perform this sacrament.
Q: Objection 1: It seems that one may lawfully receive Communion from heretical, excommunicate, or even sinful priests, and to hear mass said by them. Because, as Augustine says (Contra Petilian. iii), "we should not avoid God's sacraments, whether they be given by a good man or by a wicked one." But priests, even if they be sinful, or heretics, or excommunicate, perform a valid sacrament. Therefore it seems that one ought not to refrain from receiving Communion at their hands, or from hearing their mass.

Obj. 2: Further, Christ's true body is figurative of His mystical body, as was said above (Q. 67, A. 2). But Christ's true body is consecrated by the priests mentioned above. Therefore it seems that whoever belongs to His mystical body can communicate in their sacrifices.

Obj. 3: Further, there are many sins graver than fornication. But it is not forbidden to hear the masses of priests who sin otherwise. Therefore, it ought not to be forbidden to hear the masses of priests guilty of this sin.
Q: Objection 1: It seems to be lawful for a priest to refrain entirely from consecrating the Eucharist. Because, as it is the priest's office to consecrate the Eucharist, so it is likewise to baptize and administer the other sacraments. But the priest is not bound to act as a minister of the other sacraments, unless he has undertaken the care of souls. Therefore, it seems that likewise he is not bound to consecrate the Eucharist except he be charged with the care of souls.

Obj. 2: Further, no one is bound to do what is unlawful for him to do; otherwise he would be in two minds. But it is not lawful for the priest who is in a state of sin, or excommunicate, to consecrate the Eucharist, as was said above (A. 7). Therefore it seems that such men are not bound to celebrate, and so neither are the others; otherwise they would be gainers by their fault.

Obj. 3: Further, the priestly dignity is not lost by subsequent weakness: because Pope Gelasius I says (cf. Decretal, Dist. 55): "As the canonical precepts do not permit them who are feeble in body to approach the priesthood, so if anyone be disabled when once in that state, he cannot lose that he received at the time he was well." But it sometimes happens that those who are already ordained as priests incur defects whereby they are hindered from celebrating, such as leprosy or epilepsy, or the like. Consequently, it does not appear that priests are bound to celebrate.
Q: Whether Christ Is Sacrificed in This Sacrament?

A: On the contrary,
Augustine says in the Liber Sentent. Prosp. (cf. Ep. xcviii): "Christ was sacrificed once in Himself, and yet He is sacrificed daily in the Sacrament."

I answer that,
The celebration of this sacrament is called a sacrifice for two reasons. First, because, as Augustine says (Ad Simplician. ii), "the images of things are called by the names of the things whereof they are the images; as when we look upon a picture or a fresco, we say, 'This is Cicero and that is Sallust.'" But, as was said above (Q. 79, A. 1), the celebration of this sacrament is an image representing Christ's Passion, which is His true sacrifice. Accordingly the celebration of this sacrament is called Christ's sacrifice. Hence it is that Ambrose, in commenting on Heb. 10:1, says: "In Christ was offered up a sacrifice capable of giving eternal salvation; what then do we do? Do we not offer it up every day in memory of His death?" Secondly it is called a sacrifice, in respect of the effect of His Passion: because, to wit, by this sacrament, we are made partakers of the fruit of our Lord's Passion. Hence in one of the Sunday Secrets (Ninth Sunday after Pentecost) we say: "Whenever the commemoration of this sacrifice is celebrated, the work of our redemption is enacted." Consequently, according to the first reason, it is true to say that Christ was sacrificed, even in the figures of the Old Testament: hence it is stated in the Apocalypse (13:8): "Whose names are not written in the Book of Life of the Lamb, which was slain from the beginning of the world." But according to the second reason, it is proper to this sacrament for Christ to be sacrificed in its celebration.

Reply Obj. 1: As Ambrose says (commenting on Heb. 10:1), "there is but one victim," namely that which Christ offered, and which we offer, "and not many victims, because Christ was offered but once: and this latter sacrifice is the pattern of the former. For, just as what is offered everywhere is one body, and not many bodies, so also is it but one sacrifice."

Reply Obj. 2: As the celebration of this sacrament is an image representing Christ's Passion, so the altar is representative of the cross itself, upon which Christ was sacrificed in His proper species.

Reply Obj. 3: For the same reason (cf. Reply Obj. 2) the priest also bears Christ's image, in Whose person and by Whose power he pronounces the words of consecration, as is evident from what was said above (Q. 82, AA. 1, 3). And so, in a measure, the priest and victim are one and the same.
Q: Objection 1: It seems that Christ is not sacrificed in the celebration of this sacrament. For it is written (Heb. 10:14) that "Christ by one oblation hath perfected for ever them that are sanctified." But that oblation was His oblation. Therefore Christ is not sacrificed in the celebration of this sacrament.

Obj. 2: Further, Christ's sacrifice was made upon the cross, whereon "He delivered Himself for us, an oblation and a sacrifice to God for an odor of sweetness," as is said in Eph. 5:2. But Christ is not crucified in the celebration of this mystery. Therefore, neither is He sacrificed.

Obj. 3: Further, as Augustine says (De Trin. iv), in Christ's sacrifice the priest and the victim are one and the same. But in the celebration of this sacrament the priest and the victim are not the same. Therefore, the celebration of this sacrament is not a sacrifice of Christ.
Q: Objection 1: It seems that the time for celebrating this mystery has not been properly determined. For as was observed above (A. 1), this sacrament is representative of our Lord's Passion. But the commemoration of our Lord's Passion takes place in the Church once in the year: because Augustine says (Enarr. ii in Ps. 21): "Is not Christ slain as often as the Pasch is celebrated? Nevertheless, the anniversary remembrance represents what took place in by-gone days; and so it does not cause us to be stirred as if we saw our Lord hanging upon the cross." Therefore this sacrament ought to be celebrated but once a year.

Obj. 2: Further, Christ's Passion is commemorated in the Church on the Friday before Easter, and not on Christmas Day. Consequently, since this sacrament is commemorative of our Lord's Passion, it seems unsuitable for this sacrament to be celebrated thrice on Christmas Day, and to be entirely omitted on Good Friday.

Obj. 3: Further, in the celebration of this sacrament the Church ought to imitate Christ's institution. But it was in the evening that Christ consecrated this sacrament. Therefore it seems that this sacrament ought to be celebrated at that time of day.

Obj. 4: Further, as is set down in the Decretals (De Consecr., dist. i), Pope Leo I wrote to Dioscorus, Bishop of Alexandria, that "it is permissible to celebrate mass in the first part of the day." But the day begins at midnight, as was said above (Q. 80, A. 8, ad 5). Therefore it seems that after midnight it is lawful to celebrate.

Obj. 5: Further, in one of the Sunday Secrets (Ninth Sunday after Pentecost) we say: "Grant us, Lord, we beseech Thee, to frequent these mysteries." But there will be greater frequency if the priest celebrates several times a day. Therefore it seems that the priest ought not to be hindered from celebrating several times daily.
Q: Objection 1: It seems that the words spoken in this sacrament are not properly framed. For, as Ambrose says (De Sacram. iv), this sacrament is consecrated with Christ's own words. Therefore no other words besides Christ's should be spoken in this sacrament.

Obj. 2: Further, Christ's words and deeds are made known to us through the Gospel. But in consecrating this sacrament words are used which are not set down in the Gospels: for we do not read in the Gospel, of Christ lifting up His eyes to heaven while consecrating this sacrament: and similarly it is said in the Gospel: "Take ye and eat" (
comedite
) without the addition of the word "all," whereas in celebrating this sacrament we say: "Lifting up His eyes to heaven," and again, "Take ye and eat (
manducate
) of this." Therefore such words as these are out of place when spoken in the celebration of this sacrament.

Obj. 3: Further, all the other sacraments are ordained for the salvation of all the faithful. But in the celebration of the other sacraments there is no common prayer put up for the salvation of all the faithful and of the departed. Consequently it is unbecoming in this sacrament.

Obj. 4: Further, Baptism especially is called the sacrament of faith. Consequently, the truths which belong to instruction in the faith ought rather to be given regarding Baptism than regarding this sacrament, such as the doctrine of the apostles and of the Gospels.

Obj. 5: Further, devotion on the part of the faithful is required in every sacrament. Consequently, the devotion of the faithful ought not to be stirred up in this sacrament more than in the others by Divine praises and by admonitions, such as, "Lift up your hearts."

Obj. 6: Further, the minister of this sacrament is the priest, as stated above (Q. 82, A. 1). Consequently, all the words spoken in this sacrament ought to be uttered by the priest, and not some by the ministers, and some by the choir.

Obj. 7: Further, the Divine power works this sacrament unfailingly. Therefore it is to no purpose that the priest asks for the perfecting of this sacrament, saying: "Which oblation do thou, O God, in all," etc.

Obj. 8: Further, the sacrifice of the New Law is much more excellent than the sacrifice of the fathers of old. Therefore, it is unfitting for the priest to pray that this sacrifice may be as acceptable as the sacrifice of Abel, Abraham, and Melchisedech.
Q: Objection 9: Further, just as Christ's body does not begin to be in this sacrament by change of place, as stated above (Q. 75, A. 2), so likewise neither does it cease to be there. Consequently, it is improper for the priest to ask: "Bid these things be borne by the hands of thy holy angel unto Thine altar on high."
Q: Objection 1: It seems that the actions performed in celebrating this mystery are not becoming. For, as is evident from its form, this sacrament belongs to the New Testament. But under the New Testament the ceremonies of the old are not to be observed, such as that the priests and ministers were purified with water when they drew nigh to offer up the sacrifice: for we read (Ex. 30:19, 20): "Aaron and his sons shall wash their hands and feet . . . when they are going into the tabernacle of the testimony . . . and when they are to come to the altar." Therefore it is not fitting that the priest should wash his hands when celebrating mass.

Obj. 2: Further, (Ex. 30:7), the Lord commanded Aaron to "burn sweet-smelling incense" upon the altar which was "before the propitiatory": and the same action was part of the ceremonies of the Old Law. Therefore it is not fitting for the priest to use incense during mass.

Obj. 3: Further, the ceremonies performed in the sacraments of the Church ought not to be repeated. Consequently it is not proper for the priest to repeat the sign of the cross many times over this sacrament.

Obj. 4: Further, the Apostle says (Heb. 7:7): "And without all contradiction, that which is less, is blessed by the better." But Christ, Who is in this sacrament after the consecration, is much greater than the priest. Therefore quite unseemingly the priest, after the consecration, blesses this sacrament, by signing it with the cross.

Obj. 5: Further, nothing which appears ridiculous ought to be done in one of the Church's sacraments. But it seems ridiculous to perform gestures, e.g. for the priest to stretch out his arms at times, to join his hands, to join together his fingers, and to bow down. Consequently, such things ought not to be done in this sacrament.

Obj. 6: Further, it seems ridiculous for the priest to turn round frequently towards the people, and often to greet the people. Consequently, such things ought not to be done in the celebration of this sacrament.

Obj. 7: Further, the Apostle (1 Cor. 13) deems it improper for Christ to be divided. But Christ is in this sacrament after the consecration. Therefore it is not proper for the priest to divide the host.

Obj. 8: Further, the ceremonies performed in this sacrament represent Christ's Passion. But during the Passion Christ's body was divided in the places of the five wounds. Therefore Christ's body ought to be broken into five parts rather than into three.
Q: Objection 9: Further, Christ's entire body is consecrated in this sacrament apart from the blood. Consequently, it is not proper for a particle of the body to be mixed with the blood.