Ecclesiastes 10:8-10

Modern English Version

⁸ He who digs a pit will fall into it,
    and whoever breaks through a wall will be bitten by a serpent.
⁹ He who quarries stones is injured by them,
    and he who splits wood is in danger from them.

¹⁰ If an iron piece is blunt
    and there is no one to sharpen it,
then he must prevail with more strength;
    but wisdom is a benefit to succeed.