When we forgive our neighbor, in flows the forgiveness of God’s forgiveness to us. For God to withhold his forgiveness from the one who will not forgive his neighbor is love as well as necessity. If God said, “I forgive you,” to a man who hated his brother, what would it mean to him? How would the man interpret it? Would it not mean to him, “You may go on hating. I do not mind it. You have had great provocation, and are justified in your hate.” No, the hater must be delivered from the hell of his hate, that God’s child should be made the loving child that he meant him to be.
— George MacDonald, Wisdom to Live By, p. 162