Roman Catechism 19.35

Chapter 19 — Part II: The Sacraments — Penance

Section 35. How thankful, then, should not sinners be to God for having bestowed such ample power on the priests of His Church ! Unlike the priests of the Old Law who merely declared the leper cleansed from his leprosy, the power now given to the priests of the New Law is not limited to declaring the sinner absolved from his sins, but, as a minister of God, he truly absolves from sin. This is an effect of which God Himself, the author and source of grace and justice, is the principal cause.