"The peacemaker is the man who does not talk about people when they are offensive and difficult. He does not ask, 'Why are they like that?' He says, 'They are like that because they are still being governed by the god of this world, "the spirit that now worketh in the children of disobedience." That poor person is a victim of self and of Satan; he is hell bound; I must have pity and mercy upon him.' The moment he begins to look at him like that he is in a position to help him, and he is likely to make peace with him. So you must have an entirely new view of the other person."
--D. Martyn Lloyd-Jones, in a sermon called, "Blessed Are the Peacemakers," Studies in the Sermon on the Mount