I recently had the privilege of reading a pamphlet of excerpts from Jonathan Edwards' book Charity and its Fruits. I would suggest reading it. A powerful book, it exposes the sins of anger for what they are, not causes found in other people, but in ourselves.
Edwards gives four points upon anger.
Consider your own failings
It destroys you
It unfits you for duty to God
It unfits you to live in society
Through His Strength We Will Conquer,
Andrew C. Abbott