Proverbs 27:1-4

New International Version - UK

27 Do not boast about tomorrow,
    for you do not know what a day may bring.

² Let someone else praise you, and not your own mouth;
    an outsider, and not your own lips.

³ Stone is heavy and sand a burden,
    but a fool’s provocation is heavier than both.

⁴ Anger is cruel and fury overwhelming,
    but who can stand before jealousy?