St. Augustine on Confession and Reconciliation

Whoever confesses his sins . . . is already working with God. God indicts your sins; if you also indict them, you are joined with God. Man and sinner are, so to speak, two realities: when you hear “man” – this is what God has made; when you hear “sinner” – this is what man himself has made. Destroy what you have made, so that God may save what he has made. . . . When you begin to abhor what you have made, it is then that your good works are beginning, since you are accusing yourself of your evil works. The beginning of good works is the confession of evil works. You do the truth and come to the light.

St. Augustine – referenced in CCC Paragraph 1458

St. Isidore of Seville on the Sacrament of Confession

Confession heals, confession justifies, confession grants pardon of sin. All hope consists in confession. In confession there is a chance for mercy. Believe it firmly. Do not doubt, do not hesitate, never despair of the mercy of God. Hope and have confidence in confession.

St. Isidore of Seville