Proverbs 12:20

20 Deceit is in the heart of those who plot evil,
The contrast here is between “evil” (= pain and calamity) and “peace” (= social wholeness and well-being); see, e.g., Pss 34:14 and 37:37.

but those who promote peace
Heb “those who are counselors of peace.” The term שָׁלוֹם (shalom, “peace”) is an objective genitive, so the genitive-construct “counselors of peace” means those who advise, advocate or promote peace (cf. NAB, NIV).
have joy.
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