Ecclesiastes 10:9-13

One who quarries stones may be hurt by them, and one who splits logs may be endangered by them.

If the axe is dull and he does not sharpen its edge, then he must exert more strength. Wisdom has the advantage of bringing success.

If the serpent bites before being charmed, there is no benefit for the charmer.

Words from the mouth of a wise person are gracious, while the lips of a fool consume him;

the beginning of his talking is foolishness, and the end of it is evil insanity.