Sirach 22:9LXX

7He that teacheth a fool, is like one that glueth a potsherd together.

8He that telleth a word to him that heareth not, is like one that waketh a man out of a deep sleep.

9He speaketh with one that is asleep, who uttereth wisdom to a fool: and in the end of the discourse he saith: Who is this?

10Weep for the dead, for his light hath failed: and weep for the fool, for his understanding faileth.

11Weep but a little for the dead, for he is at rest.