There are very few instances where the long-term use of anger will be of help to you. I want to make clear, once a situation has passed, both the long-term naming of angry feelings and the expression of anger rarely lead to good results. Anger can be a wonderful short-term solution to your life’s difficulties, yet it is rarely a good long-term solution to painful events. Anger is simply our way of reminding ourselves that we have a problem that needs attention. Yet too often we get angry instead of taking constructive action, or we get angry because we do not know what else to do.
It is my contention that the long-term experience of anger, or what we call a grievance, is almost never helpful.
— Dr. Fred Luskin, Forgive for Good, p. 14.