Proverbs 27:1-3

New International Version

27 Do not boast^(A) about tomorrow,
    for you do not know what a day may bring.^(B)

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

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