"We are by nature a people who have the Law of Retaliation in our hearts: an eye for an eye and a tooth for a tooth (Ex. 21:24). But Jesus taught and lived a greater principle: 'I tell you, Do not resist an evil person. If someone strikes you on the right cheek, turn to him the other also' (Matt. 5:39). His first response was not to extract revenge, but to give the other person a chance. This is quite 'unnatural'; in fact, it is a work of God in someone's life to not retaliate against one who has wounded him or her."
Henry Cloud and John Townsend, How People Grow