Yet you say, Because I am innocent, surely his anger shall turn from me. Behold, I will plead with you, because you say, I have not sinned.
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Cyril of Alexandria
For God readily accepts and has mercy on those who do not forget their offenses but fall down before him and ask of him forgiveness. But he is severe, and very justly so, on the hardhearted and the proud, and on one who in his great ignorance acquits himself of blame. For God said to one thus disposed, Behold, I have a suit against you, because you say, I have not sinned. For who can boast that he has a pure heart? Or who can have confidence that he is undefiled by sins? The road then to salvation, and which delivers those who earnestly walk on it from the wrath of God, is the confession of offenses, and to say in our prayers to him who purifies the wicked, Forgive us our sins. - "Commentary on Luke, Homily 76"
Let us, therefore, pray without ceasing, according to the expression of the blessed Paul. Let us be careful to do so aright.… Remember him who says by the voice of Isaiah, Declare your sins first, that you may be justified; remember too that he rebukes those who will not do so and says, Behold, I have a judgment against you, because you say I have not sinned. Examine the words of the saints, for one says, “The righteous is the accuser of himself in the beginning of his words,” and another says, “I said, I will confess against myself my transgression to the Lord; and you forgave the iniquity of my heart.” - "Commentary on Luke, Homily 120"
It makes God angry for us to imagine that we are free from all impurity. He is even found saying to one of those who led polluted lives, Behold, I have a suit with you because you say I have not sinned, in that you have acted very contemptuously in repeating your ways. For the repetition of the way to sins is for us, when we are overtaken by offenses, to refuse to believe that we are guilty of the defilement that arises from them. - "Commentary on Luke, Homily 149"