Be angry and do not sin; do not let the sun go down on your anger, —Ephesians 4:26
Richard Baxter instructs believers in the battle against anger:
Be careful to keep a humbled soul that does not think too highly of itself, for humility is patient and does not exaggerate injuries.
A proud man considers things as heinous or intolerable that are said or done against him. He that thinks lowly of himself sees things done or said against him as of little significance. He that magnifies himself sees offences against him also magnified. Pride is a very impatient sin: There is no pleasing a proud person, without a great deal of wit, care, and diligence. You must take as much care around him as you do around straw or gunpowder when you are holding a candle [Proverbs 13:10; 28:25; 21:24; Psalm 21:24]. Humility, meekness, and patience live and die together! (Anger Management, p. 27)