Sirach 27:2-4

Revised Standard Version Catholic Edition

² As a stake is driven firmly into a fissure between stones,
    so sin is wedged in between selling and buying.
³ If a man is not steadfast and zealous in the fear of the Lord,
    his house will be quickly overthrown.

⁴ When a sieve is shaken, the refuse remains;
    so a man’s filth remains in his thoughts.