Ecclesiastes 10:9-11

New Century Version

⁹ anyone who moves boulders might be hurt by them;
    and anyone who cuts logs might be harmed by them.
¹⁰ A dull ax means
    harder work.
    Being wise will make it easier.
¹¹ If a snake bites the tamer before it is tamed,
    what good is the tamer?