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Proverbs 20:9 (WEB)
Who can say, “I have made my heart pure. I am clean and without sin”?

Fathers and councils · 10

Jerome, Against Jovinianus Book 2
“But we, according to the Epistle of James, “all stumble in many things,” and“no one is pure from sin, no not if his life be but a day long.”For who will boast “that he has a clean heart? or who will be sure that he is pure from sin?”” — editor's note: Prov. xx. 9.
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Jerome, Against the Pelagians Book 1
“xx. 9.” — the author cites it
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Jerome, Against the Pelagians Book 2
“Prov. xx. 9.” — the author cites it
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Jerome, Letters Letter 125
““Who can say,” writes the wise man, “I have made my heart clean?”” — editor's note: Prov. xx. 9.
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Jerome, Letters Letter 133
“…doeth good and sinneth not:” and again, “if thy people sin against thee, for there is no man that sinneth not:” and “who can say, I have made my heart clean?” and “none is clean from stain, not even if his life on earth has been but for one day.”” — editor's note: Prov. xx. 9.
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John Cassian, Conferences XVIII–XXIV XXIII.17Conference XXIII
“…that he is pure from sin?” and again: “There is not a righteous man upon earth that doeth good and sinneth not;” and this also: “Who knoweth his faults?”” — editor's note: Ps. cxlii. (cxliii.) 2; Prov. xx. 9; Eccl. vii. 21; Ps. xviii. (xix.) 13.
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Augustine of Hippo, Expositions on the Psalms Psalm 149
“There is then, so to speak, a limit to glorying in our conscience, namely, to know that thy faith is sincere, thy hope sure, thy love without dissimulation.” — editor's note: Prov. xx. 9.
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Augustine of Hippo, Of Holy Virginity Chapter 48
““Who shall boast that he hath a chaste heart? or who shall boast that he is clean from sin?”” — editor's note: Prov. xx. 9
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Augustine of Hippo, Tractates on the Gospel of John Tractate 41
“For “when” as the Scripture speaketh, “the righteous king sitteth on the throne, who will boast of having a clean heart? or who will boast that he is pure from his sin?”” — editor's note: Prov. xx. 8, 9.
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Cyprian of Carthage, On Works and Alms
“Nor let any one so flatter himself with the notion of a pure and immaculate heart, as, in dependence on his own innocence, to think that the medicine needs not to be applied to his wounds; since it is written, “Who shall boast that he hath a clean heart, or who shall boast that he is pure from sins?”” — editor's note: Prov. xx. 9.
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