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 to Objection 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 to Objection 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 to Objection 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.
Whether a degraded priest can consecrate this sacrament?
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.
Objection 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.
Objection 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.
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 to Objection 1: That Canon is speaking, not as by way of assertion, but by way of inquiry, as can be gleaned from the context.
Reply to Objection 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 Mat. 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 to Objection 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.
Whether it is permissible to receive communion from heretical, excommunicate, or sinful priests, and to hear mass said by them?
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.
Objection 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.
Objection 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.
On the contrary, The Canon says (Dist. 32): "Let no one hear the mass of a priest whom he knows without doubt to have a concubine." Moreover, Gregory says (Dial. iii) that "the faithless father sent an Arian bishop to his son, for him to receive sacrilegiously the consecrated Communion at his hands. But, when the Arian bishop arrived, God's devoted servant rebuked him, as was right for him to do."
I answer that, As was said above (AA[5],7), heretical, schismatical, excommunicate, or even sinful priests, although they have the power to consecrate the Eucharist, yet they do not make a proper use of it; on the contrary, they sin by using it. But whoever communicates with another who is in sin, becomes a sharer in his sin. Hence we read in John's Second Canonical Epistle (11) that "He that saith unto him, God speed you, communicateth with his wicked works." Consequently, it is not lawful to receive Communion from them, or to assist at their mass.
Still there is a difference among the above, because heretics, schismatics, and excommunicates, have been forbidden, by the Church's sentence, to perform the Eucharistic rite. And therefore whoever hears their mass or receives the sacraments from them, commits sin. But not all who are sinners are debarred by the Church's sentence from using this power: and so, although suspended by the Divine sentence, yet they are not suspended in regard to others by any ecclesiastical sentence: consequently, until the Church's sentence is pronounced, it is lawful to receive Communion at their hands, and to hear their mass. Hence on 1 Cor. 5:11 , "with such a one not so much as to eat," Augustine's gloss runs thus: "In saying this he was unwilling for a man to be judged by his fellow man on arbitrary suspicion, or even by usurped extraordinary judgment, but rather by God's law, according to the Church's ordering, whether he confess of his own accord, or whether he be accused and convicted."
Reply to Objection 1: By refusing to hear the masses of such priests, or to receive Communion from them, we are not shunning God's sacraments; on the contrary, by so doing we are giving them honor (hence a host consecrated by such priests is to be adored, and if it be reserved, it can be consumed by a lawful priest): but what we shun is the sin of the unworthy ministers.
Reply to Objection 2: The unity of the mystical body is the fruit of the true body received. But those who receive or minister unworthily, are deprived of the fruit, as was said above (A[7]; Q[80], A[4]). And therefore, those who belong to the unity of the Faith are not to receive the sacrament from their dispensing.
Reply to Objection 3: Although fornication is not graver than other sins, yet men are more prone to it, owing to fleshly concupiscence. Consequently, this sin is specially inhibited to priests by the Church, lest anyone hear the mass of one living in concubinage. However, this is to be understood of one who is notorious, either from being convicted and sentenced, or from having acknowledged his guilt in legal form, or from it being impossible to conceal his guilt by any subterfuge.
Whether it is lawful for a priest to refrain entirely from consecrating the Eucharist?