John Chrysostom

Groan bitterly, sacrifice confession, (for, saith he, "Declare thou first thy transgressions that thou mayest be justified,") sacrifice contrition of heart. These victims turn not to ashes nor dissolve into smoke nor melt into air; neither need they wood and fire, but only a deep-pricked heart. This is wood, this is fire to burn, yet not consume them. For he that prayeth with warmth is burnt, yet not consumed; but like gold that is tried by fire becometh brighter.

Homilies On 2 Corinthians 5:4 ↗

Ambrose of Milan

You have blotted it out, indeed, in your hearts and minds, but the Word of God is not blotted out, the Holy Spirit is not blotted out but turns away from impious minds. It is not grace but iniquity that is blotted out; for it is written, "I am he, I am he who blots out your iniquities."

On the Holy Spirit 3.10.61 ↗

Jerome

I am, I am myself, who blots out your iniquities for my own sake, and I will not remember your sins. Bring me to remembrance, let us argue together; set forth your case, that you may be proved right. Your first ancestor sinned, and your interpreters transgressed against me. And I profaned the princes of the sanctuary, and delivered Jacob to destruction and Israel to reviling. LXX: I am, I am he who blots out your iniquities, and I will not remember. But remember, and let us argue together. …

Commentary on Isaiah ↗

John Cassian

"Forgive us our debts as we also forgive our debtors." Whoever then desires to obtain forgiveness of his sins, should study to fit himself for it by these means. Let not the stubbornness of an obdurate heart turn away any from the saving remedy and the fount of so much goodness, because even if we have done all these things, they will not be able to expiate our offences, unless they are blotted out by the goodness and mercy of the Lord, who when He sees the service of pious efforts offered by us with a humble heart, supports our …

Conference 20.8 ↗