Proverbs 12:20

Deceit is in the heart of them that imagine evil: but to the counsellors of peace is joy.

Deceit is in the heart of them that imagine evil. "Deceit," producing sorrow, is in the heart of them that devise "evil," and therefore strife (the opposite of "peace"). The opposite follows:

But to the counselors of peace is joy. But to the counselors of good (the opposite of "evil") and "peace," is candour (the opposite of "deceit"), and therefore "joy."