Reply to Objection 2: Christ's Passion was sufficiently satisfactory for the sins of the whole world, so that without prejudice to Divine justice something can be remitted from the punishment which a sinner deserves, in so far as the effect of Christ's Passion reaches him through the sacraments of the Church.
Reply to Objection 3: Some satisfactory punishment must remain for each sin, so as to provide a remedy against it. Wherefore though, by virtue of the absolution some measure of the punishment due to a grave sin is remitted, it does not follow that the same measure of punishment is remitted for each sin, because in that case some sin would remain without any punishment at all: but, by virtue of the keys, the punishments due to various sins are remitted in due proportion.
Reply to Objection 4: Some say that at the first absolution, as much as possible is remitted by virtue of the keys, and that, nevertheless, the second confession is valid, on account of the instruction received, on account of the additional surety, on account of the prayers of the priest or confessor, and lastly on account of the merit of the shame.
But this does not seem to be true, for though there might be a reason for repeating the confession, there would be no reason for repeating the absolution, especially if the penitent has no cause to doubt about his previous absolution; for he might just as well doubt after the second as after the first absolution: even as we see that the sacrament of Extreme Unction is not repeated during the same sickness, for the reason that all that could be done through the sacrament, has been done once. Moreover, in the second confession, there would be no need for the confessor to have the keys, if the power of the keys had no effect therein.
For these reasons others say that even in the second absolution something of the punishment is remitted by virtue of the keys, because when absolution is given a second time, grace is increased, and the greater the grace received, the less there remains of the blemish of the previous sin, and the less punishment is required to remove that blemish. Wherefore even when a man is first absolved, his punishment is more or less remitted by virtue of the keys, according as he disposes himself more or less to receive grace; and this disposition may be so great, that even by virtue of his contrition the whole punishment is remitted, as we have already stated (Q[5], A[2]). Consequently it is not unreasonable, if by frequent confession even the whole punishment be remitted, that a sin remain altogether unpunished, since Christ made satisfaction for its punishment.
Whether the priest can bind through the power of the keys?
Objection 1: It would seem that the priest cannot bind by virtue of the power of the keys. For the sacramental power is ordained as a remedy against sin. Now binding is not a remedy for sin, but seemingly is rather conducive to an aggravation of the disease. Therefore, by the power of the keys, which is a sacramental power, the priest cannot bind.
Objection 2: Further, just as to loose or to open is to remove an obstacle, so to bind is to place an obstacle. Now an obstacle to heaven is sin, which cannot be placed on us by an extrinsic cause, since no sin is committed except by the will. Therefore the priest cannot bind.
Objection 3: Further, the keys derive their efficacy from Christ's Passion. But binding is not an effect of the Passion. Therefore the priest cannot bind by the power of the keys.
On the contrary, It is written ( Mat. 16:19 ): "Whatsoever thou shalt bind on earth, shall be bound also in heaven."
Further, rational powers are directed to opposites. But the power of the keys is a rational power, since it has discretion connected with it. Therefore it is directed to opposites. Therefore if it can loose, it can bind.
I answer that, The operation of the priest in using the keys, is conformed to God's operation, Whose minister he is. Now God's operation extends both to guilt and to punishment; to the guilt indeed, so as to loose it directly. but to bind it indirectly, in so far as He is said to harden, when He withholds His grace; whereas His operation extends to punishment directly, in both respects, because He both spares and inflicts it. In like manner, therefore, although the priest, in absolving, exercises an operation ordained to the remission of guilt, in the way mentioned above (A[1]), nevertheless, in binding, he exercises no operation on the guilt; (unless he be said to bind by not absolving the penitent and by declaring him to be bound), but he has the power both of binding and of loosing with regard to the punishment. For he looses from the punishment which he remits, while he binds as to the punishment which remains. This he does in two ways---first as regards the quantity of the punishment considered in general, and thus he does not bind save by not loosing, and declaring the penitent to be bound, secondly, as regards this or that particular punishment, and thus he binds to punishment by imposing it.
Reply to Objection 1: The remainder of the punishment to which the priest binds the penitent, is the medicine which cleanses the latter from the blemish of sin.
Reply to Objection 2: Not only sin, but also punishment is an obstacle to heaven: and how the latter is enjoined by the priest, has been said in the article.
Reply to Objection 3: Even the Passion of Christ binds us to some punishment whereby we are conformed to Him.
Whether the priest can bind and loose according to his own judgment?
Objection 1: It seems that the priest can bind and loose according to his own judgment. For Jerome [*Cf. Can. 86, Mensuram, De Poenit. Dist. i] says: "The canons do not fix the length of time for doing penance so precisely as to say how each sin is to be amended, but leave the decision of this matter to the judgment of a discreet priest." Therefore it seems that he can bind and loose according to his own judgment.
Objection 2: Further, "The Lord commended the unjust steward, forasmuch as he had done wisely" ( Lk. 16:5 ), because he had allowed a liberal discount to his master's debtors. But God is more inclined to mercy than any temporal lord. Therefore it seems that the more punishment the priest remits, the more he is to be commended.
Objection 3: Further, Christ's every action is our instruction. Now on some sinners He imposed no punishment, but only amendment of life, as in the case of the adulterous woman ( Jn. 8 ). Therefore it seems that the priest also, who is the vicar of Christ, can, according to his own judgment, remit the punishment, either wholly or in part.
On the contrary, Gregory VII [*Cf. Act. Concil. Rom. v, Can. 5] says: "We declare it a mock penance if it is not imposed according to the authority of the holy fathers in proportion to the sin." Therefore it seems that it does not altogether depend on the priest's judgment.
Further, the act of the keys requires discretion. Now if the priest could remit and impose as much as he liked of a penance, he would have no need of discretion, because there would be no room for indiscretion. Therefore it does not altogether depend on the priest's judgment.
I answer that, In using the keys, the priest acts as the instrument and minister of God. Now no instrument can have an efficacious act, except in so far as it is moved by the principal agent. Wherefore, Dionysius says (Hier. Eccl. cap. ult.) that "priests should use their hierarchical powers, according as they are moved by God." A sign of this is that before the power of the keys was conferred on Peter ( Mat. 16:19 ) mention is made of the revelation vouchsafed to him of the Godhead; and the gift of the Holy Ghost, whereby "the sons of God are led" ( Rom. 8:14 ), is mentioned before power was given to the apostles to forgive sins. Consequently if anyone were to presume to use his power against that Divine motion, he would not realize the effect, as Dionysius states (Hier. Eccl., cap. ult.), and, besides, he would be turned away from the Divine order, and consequently would be guilty of a sin. Moreover, since satisfactory punishments are medicinal, just as the medicines prescribed by the medical art are not suitable to all, but have to be changed according to the judgment of a medical man, who follows not his own will, but his medical science, so the satisfactory punishments appointed by the canons are not suitable to all, but have to be varied according to the judgment of the priest guided by the Divine instinct. Therefore just as sometimes the physician prudently refrains from giving a medicine sufficiently efficacious to heal the disease, lest a greater danger should arise on account of the weakness of nature so the priest, moved by Divine instinct, some times refrains from enjoining the entire punishment due to one sin, lest by the severity of the punishment, the sick man come to despair and turn away altogether from repentance.
Reply to Objection 1: This judgment should be guided entirely by the Divine instinct.
Reply to Objection 2: The steward is commended also for having done wisely. Therefore in the remission of the due punishment, there is need for discretion.
Reply to Objection 3: Christ had the power of "excellence" in the sacraments, so that, by His own authority, He could remit the punishment wholly or in part, just as He chose. Therefore there is no comparison between Him and those who act merely as ministers.