They speak vanity every one with his neighbor: with flattering lips and with a double heart do they speak.
All Commentaries on Psalms 12:2 Go To Psalms 12
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.