Sirach 22:7

7 Whoso teacheth a fool is as one that glueth a potsherd together, and as he that waketh one from a sound sleep.

Sirach 22:7 In-Context

5 She that is bold dishonoureth both her father and her husband, but they both shall despise her.

6 A tale out of season musick in mourning: but stripes and correction of wisdom are never out of time.

7 Whoso teacheth a fool is as one that glueth a potsherd together, and as he that waketh one from a sound sleep.

8 He that telleth a tale to a fool speaketh to one in a slumber: when he hath told his tale, he will say, What is the matter?

9 If children live honestly, and have wherewithal, they shall cover the baseness of their parents.