Wise conversation is way over the head of fools; in a serious discussion they haven’t a clue.
Wisdom is too high for a fool: He openeth not his mouth in the gate.
Wisdom is too high for a fool; he opens not his mouth in the gate [where the city's rulers sit in judgment].
Wisdom is beyond foolish people. They don’t open their mouths in the gate.
Wisdom is beyond the foolish; at the gate he will not open his mouth.
Wisdom is too high for a fool, in the gate he shall not open his mouth.