Thomas Aquinas

“ It is enough for one who is ignorant of a language, to confess by writing, or by signs, or by an interpreter, because a man is not bound to do more than he can: although a man is not able or obliged to receive Baptism, except with water, which is from an entirely external source and is applied to us by another: whereas the act of confession is from within and is performed by ourselves, so that when we cannot confess in one way, we must confess as we can. ”

“ Moreover sometimes the punishment which would be given for one sin would foster another. Again the priest in hearing a confession takes the place of God, so that confession should be made to him just as contrition is made to God: wherefore as there would be no contrition unless one were contrite for all the sins which one calls to mind, so is there no confession unless one confess all the sins that one remembers committing. ”

“ In the absence of one's own priest, confession may be made even to a layman, so that there is no necessity to confess in writing, because the act of confession is more essential than the person to whom confession is made. ”

“ Confession should be made not publicly but privately, lest others be scandalized, and led to do evil through hearing the sins confessed. On the other hand, the penance enjoined in satisfaction does not give rise to scandal, since like works of satisfaction are done sometimes for slight sins, and sometimes for none at all. ”

“ Further, it may happen that a man after going to confession and performing his penance, remembers a mortal sin, which escaped his memory while confessing, and that his own priest to whom he confessed first is no longer available, so that he can only confess that sin to another priest, and thus he will confess different sins to different priests. ”

“ Further, it is necessary in confession that the word should agree with the thought for the very name of confession requires this. Now if a man confess while remaining attached to sin, his word is not in accord with his thought, since in his heart he holds to sin, while he condemns it with his lips. Therefore such a man does not confess. ”

“ Contrition and satisfaction are offered to God: but confession is made to man: hence it is essential to contrition and satisfaction, but not to confession, that man should be united to God by charity.
Reply to Objection 3: He who declares the sins which he has, speaks the truth; and thus his thought agrees with his lips or words, as to the substance of confession, though it is discordant with the purpose of confession. ”

“ Reply to Objection 2: The punishment imposed by different priests would not be sufficient, because each would only consider one sin by itself, and not the gravity which it derives from being in conjunction with another. ”

“ Just as in Baptism it is not enough to wash with anything, but it is necessary to wash with a determinate element, so neither does it suffice, in Penance, to manifest one's sins anyhow, but they must be declared by a determinate act. ”