Proverbs 14:29 in the World English Bible
He who is slow to anger has great understanding, but he who has a quick temper displays folly.
Context
28 In the multitude of people is the king’s honour: but in the want of people is the destruction of the prince.
29 He that is slow to wrath is of great understanding: but he that is hasty of spirit exalteth folly.
30 A sound heart is the life of the flesh: but envy the rottenness of the bones.