Chapter 11 — Part I: The Creed — Article IX: The Holy Catholic Church; the Communion of Saints
Section 60. Communion Of Sacraments — The fruit of all the Sacraments is common to all the faithful, and these Sacraments, particularly Baptism, the door, as it were, by which we are admitted into the Church, are so many sacred bonds which bind and unite them to Christ. That this communion of Saints implies a communion of Sacraments, the Fathers declare in these words of the Creed: I confess one Baptism. After Baptism, the Eucharist holds the first place in reference to this communion, and after that the other Sacraments; for although this name (communion) is applicable to all the Sacraments, inasmuch as they unite us to God, and render us partakers of Him whose grace we receive, yet it belongs in a peculiar manner to the Eucharist which actually produces this communion.