Ecclesiastes 10:8-10

Common English Bible

⁸ Whoever digs a pit may fall into it,
    and whoever breaks through a wall
    may be bitten by a snake.
⁹ Whoever quarries stones may be injured by them;
    whoever splits logs
    may be endangered by them.
¹⁰ If an ax is dull
    and one doesn’t sharpen it first,
    then one must exert more force.
It’s profitable to be skillful and wise.