The person who receives your kindness in response to their sin is shocked into awareness. Your kindness to them makes them see the absurdity of their selfish and helps awaken them to the blessings of relationship.
Only then, Paul says, will you overcome evil. You can’t overcome evil in someone by paying them back. You’ll only perpetuate it. Your retaliation will produce more anger in them, and, in turn, more evil, if not toward you, toward someone else. You destroy the evil in someone by showing them extravagant grace.
– Greear, J.D.; Gospel: Recovering the Power that Made Christianity Revolutionary; B&H Publishing Group; Nashville, TN; Copyright 2011; Kindle Edition; page 116