Proverbs 17:3-5

Revised Standard Version

³ The crucible is for silver, and the furnace is for gold,
    and the Lord tries hearts.
⁴ An evildoer listens to wicked lips;
    and a liar gives heed to a mischievous tongue.
⁵ He who mocks the poor insults his Maker;
    he who is glad at calamity will not go unpunished.