Proverbs 16:21 in the World English Bible
The wise in heart shall be called prudent. Pleasantness of the lips promotes instruction.
Context
20 He that handleth a matter wisely shall find good: and whoso trusteth in the LORD, happy is he.
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.