בְּאָזְנֵי כְסִיל אַל תְּדַבֵּר, כִּי יָבוּז לְשֵׂכֶל מִלֶּיךָ

ביטוי (אנגלית)

Do not speak in the ears of a fool, for he will despise the wisdom of your words

הגדרה (אנגלית)

There is no point in trying to speak words of sense to a fool, for in any case he will prefer to mock what you have said.

("Do not speak in the ears of a fool, for he will despise the wisdom of your words" – Proverbs 23:9)