Psalms 79:9

Therefore there followeth, "Help us, O God, our healing One" (ver. 9). By this word which he saith, "our healing One," he doth sufficiently explain what sort of poverty he hath willed to be understood, in that which he had said, "for we have become exceeding poor." For it is that very sickness, to which a healer is necessary. But while he would have us to be aided, he is neither ungrateful to grace, nor doth he take away free-will. For he that is aided, doth also of himself something. He hath added also, "for the glory of Thy Name, O Lord, deliver us:" in order that he who glorieth, not in himself, but in the Lord may glory. "And merciful be Thou," he saith, "to our sins for Thy Name's sake:" not for our sake. For what else do our sins deserve, but due and condign punishments? But "merciful be Thou to our sins, for Thy Name's sake." Thus then Thou dost deliver us, that is, dost rescue us from evil things, while Thou dost both aid us to do justice, and art merciful to our sins, without which in this life we are not. For "in Thy sight shall no man living be justified." But sin is iniquity. And "if Thou shalt have marked iniquities, who shall stand?"

...There see: In the beginning was the Word. For it was not made at any time: but in the beginning it was. Not like a creature, of which it is said: In the beginning God created the heavens and the earth. Therefore, what was in the beginning, and the Word was with God, and the Word was God: and all things were made through Him, and without Him nothing was made: and in Him was life, which was made, it came to us. To whom? To the worthy? By no means: but to the unworthy. For Christ died for the ungodly, and the undeserving, but worthy. For we are undeserving of His mercy; but He is worthy who would have mercy, to whom it would be said: For your mercy's sake, Lord, deliver us. Not because of our preceding merits, but for your mercy's sake, Lord, deliver us; and be merciful to our sins for your name's sake, not for our merit. For not because of the merit of sins, but for your name's sake. For the merit of sins, assuredly not a reward, but a punishment. Therefore, for your name's sake.