They speak vanity every one with his neighbor: with flattering lips and with a double heart do they speak.
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Augustine of Hippo
AD 430
3. "He hath talked vanity each man to his neighbour" (ver. 2). By neighbour we must understand every man: for that there is no one with whom we should work evil; "and the love of our neighbour worketh no evil." "Deceitful lips, with a heart and a heart they have spoken evil things." The repetition, "with a heart and a heart," signifies a double heart.
Deceitful. Hebrew, "flattering "and of course not fee from deceit. (Berthier)
"That man I hate, e'en as the gates of hell, Who thinks one thing, and will another tell. "(Homer, Iliad I.)
None can have (Haydock) confidence in a liar, St. James i. 8. (Calmet)