Council of Trent: Session XIV, Penance, Chapter III

CHAPTER III. On the parts, and on the fruit of this Sacrament.

The holy synod doth furthermore teach, that the form of the sacrament of penance, wherein its force principally consists, is placed in those words of the minister, I absolve thee, &c: to which words indeed certain prayers are, according to the custom of holy Church, laudably joined, which nevertheless by no means regard the essence of that form, neither are they neces sary for the administration of the sacrament itself. But the acts of the penitent himself, to wit, contrition, confession and satisfaction, are as it were the matter of this sacrament. Which acts, inasmuch as they are, by God's institution, required in the penitent for the integrity of the sacrament, and for the full and perfect remission of sins, are for this reason called the parts of penance. But the thing signified indeed and the effect of this sacrament, as far as regards its force and efficacy, is reconciliation with God, which sometimes, in persons who are pious and who receive this sacrament with devotion, is wont to be followed by peace and serenity of conscience, with exceed ing consolation of spirit. The holy Synod, whilst delivering these things touching the parts and the effect of this sacrament, condemns at the same time the opinions of those who contend, that, the terrors which agitate the conscience, and faith, are the parts of penance.

Translation: J. Waterworth, The Canons and Decrees of the Council of Trent (1848), Hanover Historical Texts Project transcription (1995).