Chapter 19 — Part II: The Sacraments — Penance
Section 41. In pious souls who approach this Sacrament with devotion, profound peace and tranquillity of conscience, together with ineffable joy of soul, accompany this reconciliation. For there is no sin, however great or horrible, which cannot be effaced by the Sacrament of Penance, and that not merely once, but over and over again. On this point God Himself thus speaks through the Prophet: If the wicked do penance for all his sins which he hath committed, and keep all my commandments, and do judgment, and justice, living he shall live, and shall not die, and I will not remember all his iniquities that he hath done. And St. John says: If we confess our sins; he is faithful and just, to forgive us our sins; and a little later, he adds: If any man sin, -- he excepts no sin whatever, -- we have an advocate with the Father, Jesus Christ, the just; for he is the propitiation for our sins; and not for ours only, but for the sins of the whole world.