Matthew Poole and continuators on Proverbs 16:23

23 The heart of the wise teacheth his mouth , and addeth learning to his lips .

Directeth him what, and when, and how to speak, and keepeth him from speaking rashly and foolishly.

i. e. Inableth him to speak learnedly and wisely. Or, increaseth Learning (in himself and others) by (as this Hebrew Particle oft signifies, and is by some rendred here) his lips, i. e. by his wise speeches; that this may agree with the latter clause of v. 21. where this same Phrase is used.

Marginal references: Heb. maketh wise.