Chapter 19 — Part II: The Sacraments — Penance
Section 167. One Can Satisfy For Another — In this the supreme mercy and goodness of God deserve our grateful acknowledgment and praise, that He has granted to our frailty the privilege that one may satisfy for another. This, however, is a privilege which is confined to the satisfactory part of Penance alone. As regards contrition and confession, no one is able to be contrite for another; but those who are in the state of grace may pay for others what is due to God, and thus we may be said in some measure to bear each other's burdens.