Proverbs 16:22 KJV
Understanding is a wellspring of life unto him that hath it: but the instruction of fools is folly.
Proverbs 16:22, King James Version
In context
21 The wise in heart shall be called prudent: and the sweetness of the lips increaseth learning.
22 Understanding is a wellspring of life unto him that hath it: but the instruction of fools is folly.
23 The heart of the wise teacheth his mouth, and addeth learning to his lips.