Matthew Poole and continuators on Proverbs 20:15

15 There is gold , and a multitude of rubies, but the lips of knowledge are a precious jewel .

To wit, in the World, in divers mens hands, by whom it is highly prized.

But wise speeches proceeding from an understanding or honest Heart are of far greater worth and use, both to him that uttereth them▪ and to those that receive and improve them to their own benefit.

Marginal references: Ch. 3. 15. & 8. 11.