Charles Spurgeon Commentary 1 Peter 3:9

"not rendering evil for evil, or reviling for reviling; but contrariwise blessing; for hereunto were ye called, that ye should inherit a blessing." — 1 Peter 3:9 (ASV)

Not rendering evil for evil, –

That is beastlike; it is certainly not the rule for a Christian.

Good for evil is Godlike; and you, who are the children of God, should seek to act as he does: not rendering evil for evil, –

Or railing for railing: but contrariwise blessing; knowing that ye are thereunto called, that ye should inherit a blessing.

Every man should give away according to what he has. He who gives curses probably gives them because he has so much cursing in him. You can always tell what a man is like by noticing what comes from him. If he curses, it is because curses abound in him. But you are to give blessing to others because you have inherited so much blessing from Christ; your whole tone, temper, spirit, language, action should be the means of blessing to others.