Chapter 12 — Part I: The Creed — Article X: The Forgiveness of Sins
Section 19. This Remedy To Be Used — The faithful, therefore, having formed a just conception of the dignity of so excellent and exalted a blessing, should be exhorted to profit by it to the best of their ability. For he who makes no use of what is really useful and necessary must be supposed to despise it; particularly since, in communicating to the Church the power of forgiving sin, the Lord did so with the view that all should have recourse to this healing remedy. As without Baptism no one can be cleansed, so in order to recover the grace of Baptism, forfeited by actual mortal guilt, recourse must be had to another means of expiation, -- namely, the Sacrament of Penance.