Proverbs 27:20-22

Common English Bible

²⁰ The grave^[a] and the underworld^[b] are never satisfied;
    and people’s eyes are never satisfied.
²¹ A crucible is for silver and a furnace for gold;
    so are people in the presence of someone who praises them.
²² Even if you grind fools in a mortar,
    even grinding them along with the grain,
    their folly won’t be driven from them.