Proverbs 16:23 in the World English Bible
The heart of the wise instructs his mouth, and adds learning to his lips.
Context
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.
24 Pleasant words are as an honeycomb, sweet to the soul, and health to the bones.