Repentance is given to the sons of men as grace after grace, for repentance is a second regeneration by God. That of which we have received an earnest by baptism, we receive as a gift by means of repentance. Repentance is a door of mercy, opened to those who seek it. By this door we enter into the mercy of God, and apart from this entrance we shall not find mercy.
Homily 46 (p. 357)