Proverbs 27:21-23

The Voice

²¹ The crucible is used for refining silver, the furnace for gold,
    but praise is what tests a person’s mettle.
²² Though you grind a fool like grain
    in a mortar with a pestle,
    still his foolishness will not be separated from him.

²³ Pay careful attention to your flocks,
    and see to the welfare of your herds