Proverbs 20:14-15

“It is [almost] worthless, it is [almost] worthless,” says the buyer [as he negotiates the price]; But when he goes his way, then he boasts [about his bargain]. There is gold, and an abundance of pearls, But the lips of knowledge are a vessel of preciousness [the most precious of all]. [Job 28:12, 16-19; Prov 3:15; 8:11]