Ecclesiastes 10:8-10

New Catholic Bible

⁸ Whoever digs a pit will fall into it,
    and whoever breaks through a wall
    will be bitten by a snake.
⁹ Whoever quarries stones will be hurt by them,
    and whoever chops wood places himself at risk.
¹⁰ If an ax becomes dull from lack of sharpening,
    then one must exert greater strength,
    but skill helps one to succeed.