# Like a thorn ... is a proverb in the mouth of fools

"A proverb in the mouth of fools is as dangerous as a thorn that goes into the hand of a drunkard"

# a thorn that goes into the hand of a drunkard

If a drunk person holds a thornbush, a thorn will prick his hand, or if a drunk person is angry, he will pick up a thornbush and swing it at people.

# in the mouth of fools

"in the speech of fools" or "that fools say"