9 A thorn hath gone up into the hand of a drunkard, And a parable in the mouth of fools.

Matthew Henry's Commentary on Proverbs 26:9

Commentary on Proverbs 26:6-9

(Read Proverbs 26:6-9)

Fools are not fit to be trusted, nor to have any honour. Wise sayings, as a foolish man delivers and applies them, lose their usefulness.