Charles Ellicott Commentary Proverbs 12:20

"Deceit is in the heart of them that devise evil; But to the counsellors of peace is joy." — Proverbs 12:20 (ASV)

Deceit is in the heart ...—Those who plot and devise evil against others begin by deceiving them, and end by deceiving themselves also; while the counsellors of peace, who seek the good of their neighbors, bring joy to them and to themselves also through the satisfaction derived from a good conscience.