Proverbs 16:23 in the King James Version
The heart of the wise teacheth his mouth, and addeth learning to his lips.
Context
22 Understanding is a fountain of life to one who has it, but the punishment of fools is their folly.
23 The heart of the wise instructs his mouth, and adds learning to his lips.
24 Pleasant words are a honeycomb, sweet to the soul, and health to the bones.