Proverbs 17:2-4

New Revised Standard Version, Anglicised

² A slave who deals wisely will rule over a child who acts shamefully,
    and will share the inheritance as one of the family.
³ The crucible is for silver, and the furnace is for gold,
    but the Lord tests the heart.
⁴ An evildoer listens to wicked lips;
    and a liar gives heed to a mischievous tongue.