“Anger is a useful diagnostic tool. When anger erupts in us, it is a signal that  something is wrong. Something isn't working right. There is evil or incompetence  or stupidity lurking about...
What anger fails to do, though, is tell us whether the wrong is outside us or inside  us. We usually begin by assuming that the wrong is outside us – our spouse or our  child or our God has done something wrong, and we are angry. But when we track  the anger carefully, we often find it leads to a wrong within ourselves.”
~ Eugene Peterson, Under the Unpredictable Plant