Desert Fathers, on Prov 20:22

“Say not: I will return evil: wait for the Lord and he will deliver thee.”

“A brother who was hurt by another brother went to the Theban Sisois and said, 'I want to get back at a brother who has hurt me.' The hermit begged him, 'Don't do that, my son, leave vengeance in the hands of God.' But he said, 'I can't rest till I get my own back.' The hermit said, 'My brother, let us pray.' He stood and said, 'O God, we have no further need of you, for we can take vengeance by ourselves.' The brother heard it and fell at the hermit's feet, saying, 'I won't quarrel with my brother any longer; I beg you to forgive me.'”

Imported from an open dataset — not yet checked against the printed edition.