Proverbs 16:21 in the King James Version
The wise in heart shall be called prudent: and the sweetness of the lips increaseth learning.
Context
20 He who heeds the Word finds prosperity. Whoever trusts in the LORD is blessed.
21 The wise in heart shall be called prudent. Pleasantness of the lips promotes instruction.
22 Understanding is a fountain of life to one who has it, but the punishment of fools is their folly.