If I get to determine whether my anger is righteous or not, I’m in trouble. So are you. The reason: we can’t trust ourselves. “Trust in yourself” sounds like a perfectly normal thing to do. Problem is, for the believer, it isn’t biblical at all. We are deceptive to the core: The heart is deceitful above all things, and desperately sick; who can understand it? (Jer. 17:9 ESV) Or try this: There is a way that seems right to a man, but its end is the way to death. (Prov. 14:12 ESV)