Proverbs 16:21

The wise in heart shall be called prudent: the sense is either,

1. He who hath wisdom or sound knowledge in his heart, will show it by his prudence in ordering his actions. Or rather,

2. He who is truly wise, or prudent, or intelligent (all which words most commonly signify one and the same thing, both in this and in other books of Scripture) shall be so called or accounted by others. The sweetness of the lips; eloquence added to wisdom; the faculty of expressing a man's mind fitly, and freely, and acceptably. Increaseth learning; both in himself, for whilst a man teacheth others he improveth himself; and especially in others, who by this means are induced to hear and receive his good instructions. Wisdom gets a man repute with others, but this faculty of right speaking makes a wise man more instrumental to do good to others.