Be not angry that you cannot make others as you wish them to be, since you cannot make yourself as you wish to be. --Thomas a Kempis
He that is soon angry dealeth foolishly: and a man of wicked devices is hated. Proverbs 14:17
Anger is a hindrance to the Child of God. It will get you off your game plan causing you to open your mouth and insert your feet! If you constantly get angry over the least little thing, you need to get alone with God so He can work in your heart exposing the sin that keeps tripping you up. You need to confess and repent of the sin that is exposed, trusting He will help you never do it again.