The Bible differentiates between two kinds of anger: one that has a diabolical, evil, and ugly face; and the other that has a holy, righteous, and majestic face.
Ugly anger is based on selfishness, lust, and pride.
Majestic anger is based on love, purity, and truth.
Ugly anger works evil.
Righteous anger works good.
Ugly anger is impatient and destructive.
Holy anger is patient and constructive.
Ugly anger makes one's face look ugly.
Righteous anger makes one's face glow with majesty.
The Bible doesn't say "Do not be angry", but it warns against anger that is based on lust, desire for revenge, pride, and every form of sin.