The heart of the wise man instructs his mouth and adds persuasiveness to his lips.
The heart is the source of wisdom flowing from the mouth.
Pro 16:23 23 The heat of the wise maketh his mouth wise, And learning mounteth up to his lips. Regarding השׂכּיל as causative: to put into the possession of intelligence, vid., at Gen 3:6. Wisdom in the heart produceth intelligent discourse, and, as the parallel member expresses it, learning mounteth up to the lips, i.e., the learning which the man taketh into his lips (Pro 22:18; cf.
The heart of the wise teacheth his mouth,.... That is, a man that is wise in heart, as in Pro 16:21; his heart will teach his mouth what to say, when to say it, and before whom; it will prompt him to matter, that he shall not be at a loss what to say, nor how to say; it will furnish him with words and...