Chapter 19 — Part II: The Sacraments — Penance
Section 168. This is a doctrine on which the faithful cannot for a moment entertain a doubt, since we profess in the Apostle's Creed our belief in the Communion of Saints. For since we are all reborn to Christ in the same cleansing waters of Baptism and are partakers of the same Sacraments, and, above all, are nourished with the same body and blood of Christ our Lord, as our food and drink, we are all, it is manifest, members of the same body. As then the foot does not perform its functions solely for itself, but also for the sake of the eyes, and as the eyes see not only for their own sake, but for the general good of all the members, so also works of satisfaction must be considered common to us all.