Chapter 19 — Part II: The Sacraments — Penance
Section 25. Penance Is a Sacrament — That Penance is a Sacrament pastors can easily show from what follows. As Baptism is a Sacrament because it blots out all sins, and especially original sin, so for the same reason Penance, which takes away all the sins of thought and deed committed after Baptism, must be regarded as a true Sacrament in the proper sense of the word.