Proverbs 12:20 in the World English Bible
Deceit is in the heart of those who plot evil, but joy comes to the promoters of peace.
Context
19 The lip of truth shall be established for ever: but a lying tongue is but for a moment.
20 Deceit is in the heart of them that imagine evil: but to the counsellors of peace is joy.
21 There shall no evil happen to the just: but the wicked shall be filled with mischief.