Extinguishing the Fiery Dart of Sinful Anger

One of the darts that the believer is often confronted with is the fiery dart of anger. Anger, in and of itself is not sinful. Anger is very necessary and a useful reaction as a communication of feeling in reaction to another's behavior. Anger however can become sinful when we either vent or internalize it. We either blow up at someone often using damaging words or actions, or we clam up and hold on to the anger often leading to bitterness or resentment. How is the believer to handle anger righteously? How can we fulfill the command of Ephesians 4:26 "Be angry and sin not"? We must use our shield appropriately.