Genesis 27:41: Smouldering anger.

41 Esau held a grudge against Jacob because of the blessing his father had given him. He said to himself, ‘The days of mourning for my father are near; then I will kill my brother Jacob.’ NIV UK

Deal with anger before it deals with you! If you want to make progress in the Christian life, you must determine to forgive everyone who hurts you. Smouldering resentment is a form of murder in the heart. Although it may cause someone to injure another, in the mean time you do great damage to yourself. How different is the attitude we see in Jesus, praying for the forgiveness of those who crucified Him, even as He hung on the Cross. If Jesus lives inside you, just think what becomes possible for you. He calls you to forgive, and you find you can.