Proverbs 26:9

Like a thorn ¹  that goes into the hand of a drunkard, so is a proverb in the mouth of a fool. ² 

Pr 23:35

¹ sn The picture is one of seizing a thornbush and having the thorn pierce the hand (עָלָה בְיַד־, ’alah vÿyad). A drunk does not know how to handle a thornbush because he cannot control his movements and so gets hurt (W. McKane, Proverbs [OTL], 599). C. H. Toy suggests that this rather means a half-crazy drunken man brandishing a stick (Proverbs [ICC], 475). In this regard cf. NLT “a thornbush brandished by a drunkard.”

² sn A fool can read or speak a proverb but will be intellectually and spiritually unable to handle it; he will misapply it or misuse it in some way. In doing so he will reveal more of his folly. It is painful to hear fools try to use proverbs.