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Psalm 15:2 (WEB)
He who walks blamelessly and does what is right, and speaks truth in his heart;

Fathers and councils · 6

Augustine of Hippo, Against Lying Chapter 2
“…be held that which is true, but with the mouth to utter unto aliens a false thing, is no sin; and that this is written, “Who speaketh the truth in his heart:” as though this were enough for righteousness, even though a person do with his mouth speak a lie, when not his neighbor but a stranger is he that heareth it.” — editor's note: Ps. xv. 2
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Augustine of Hippo, Against Lying Chapter 14
“Wherefore, that which is written, “Who speaketh the truth in his heart,” is not so to be taken, as if, truth being retained in the heart, in the mouth one may speak a lie.” — editor's note: Ps. xv. 2
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Augustine of Hippo, Expositions on the Psalms Psalm 15
““He who walketh without stain, and worketh righteousness” (ver. 2).” — the author cites it
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Augustine of Hippo, On Lying Chapter 31
“And they who assert this, say that thus also is to be understood that which is written, “He that speaketh the truth in his heart:” because always in the heart truth must be spoken; but not always in the mouth of the body, if any cause of avoiding a greater evil require that other than is…” — editor's note: Ps. xv. 2
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Jerome, Letters Letter 84
“They agree with David when he says: “Thy word have I hid in mine heart that I might not sin against thee;” and when in another place he describes the righteous man as one “who speaketh truth with his neighbour,” that is with those who “are of the household of faith.”” — editor's note: Ps. xv. 2, 3 from memory.
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Ambrose of Milan, On the Decease of His Brother Satyrus Book 1
“…dwell in the tabernacle of God; because “he hath walked without spot, he hath worked righteousness, he hath spoken truth, he hath not deceived his neighbour;” nor did he lend his money for usury, who always wished [no more than] to retain that which was inherited.” — editor's note: Ps. xv. [xiv.] 2, 3.
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