גַּם אִם תִּכְתּוֹשׁ אֶת הָאֱוִיל לֹא תָסוּר מֵעָלָיו אִוַּלְתּוֹ

ביטוי (אנגלית)

Though you bray a fool in a mortar with a pestle, his foolishness will not depart from him

הגדרה (אנגלית)

A proverb stating that a fool’s nature cannot be corrected or changed. "If someone is foolish, it is for a long time."

(“If you crush a fool in a mortar, among the crushed grain with a pestle, his foolishness will not depart from him.” — Book of Proverbs 27:22 And likewise: “And some of the fair ones will by nature be adulterous; their foolishness will not depart from them, even if you crush them among the crushed grain.” — Immanuel of Rome, Tzintzenet HaMan ve-Egel Yarovam)