That when a wrong is received, patience is to be maintained, and vengeance to be left to God
Say not, I will avenge me of mine enemy; but wait for the Lord, that He may be your help. Also elsewhere: “To me belongs vengeance; I will repay, says the Lord.” Also in Zephaniah: “Wait on me, says the Lord, in the day of my rising again to witness; because my judgment is to the congregations of the Gentiles, that I may take kings, and pour out upon them my anger.”
Source: The Treatises of Cyprian (New Advent)