Have mercy upon me, O God, according to your lovingkindness: according unto the multitude of your tender mercies blot out my transgressions.
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Augustine of Hippo
AD 430
6. Hear therefore these words, and say thou with him: "Have pity upon me, O God, after Thy great mercy" (ver. 1). He that imploreth great mercy, confesseth great misery. Let them seek a little mercy of Thee, that have sinned in ignorance: "Have pity," he sixth, "upon me, after Thy great mercy." Relieve a deep wound after Thy great healing. Deep is what I have, but in the Almighty I take refuge. Of my own so deadly wound I should despair, unless I could find so great a Physician. "Have pity upon me, O God, after Thy great mercy: and after the multitude of Thy pities, blot out my iniquity." What he saith, "Blot out my iniquity," isthis, "Have pity upon me, O God." And what he saith, "After the multitude of Thy pities," is this, "After Thy great mercy." Because great is the mercy, many are the mercies; and of Thy great mercy, many are Thy pitying. Thou dost regard mockers to amend them, dost regard ignorant men to teach them, dost regard men confessing to pardon. Did he this in ignorance? A certain man had done some, aye many evil things he had done; "Mercy," he saith, "I obtained, because ignorant I did it in unbelief." This David could not say, "Ignorant I did it." For he was not ignorant how very evil a thing was the touching of another's wife, and how very evil a thing was the killing of the husband, who knew not of it, and was not even angered. They obtain therefore the mercy of the Lord that have in ignorance done it; and they that have knowing done it, obtain not any mercy it may chance,but "great mercy."