James 1:19–20 gives one of the clearest diagnostic statements about anger in the New Testament: "let every man be swift to hear, slow to speak, slow to wrath: for the wrath of man worketh not the righteousness of God." The Greek word for wrath here — orgē — refers not to a flash of irritation but to a settled, burning anger. James does not say anger is impossible for the righteous. He says human wrath, as a method, does not accomplish the righteousness God is after. The goal matters as much as the feeling.
Proverbs 16:32 makes a counterintuitive comparison: "he that is slow to anger is better than the mighty; and he that ruleth his spirit than he that taketh a city." The Hebrew word for "ruleth" — moshal — is the word used for ruling a kingdom. Self-mastery over anger is compared to the greatest military achievement the ancient world knew. This is not minimizing how hard it is. It is naming it as a genuine conquest — one that God honors more than the conquests the world honors.
Commentary is from a charismatic Protestant perspective, drawing on KJV text and public-domain sources including Spurgeon, Andrew Murray, and Matthew Henry.