Should crusaders strive to "stay angry"? It's a bad idea. Someone once said that staying angry is like taking poison and waiting for the other person to die. If your cause is just, you would still find the energy to fight for it even without anger. You just wouldn't be self-righteous about it. The worst effect of self-righteous anger is the inner damage. It distorts your clarity about your own sinfulness and undermines your humility. Jesus told us to love our enemies and demonstrated it by asking his Father to forgive his murderers. Christians' failure to emulate such forgiveness is one of the clearest examples of G. K. Chesterton's line that Christianity has not been tried and found wanting; it has been found difficult and not tried.
Excerpted from an article in Anger Management, a downloadable resource from Gifted For Leadership.