Proverbs 25:21-22 has a lot of challenging to oneself. Being a human, our weakness is to reciprocate others what others had done unto us. It takes God's mercy and grace to be able to do what this proverb wants us to do.
I have been in this situation and has done exactly what the proverbs is saying.
But the struggle of flesh can't be controlled without God's Spirit intervention.
Yes! after I'd done it, I got a since of peace and forgiveness. Thank you @msg768 for sharing!