ح َتَّى لَوْ طَحَنْتَ الأحمَقَ بِمِدَقَّةٍ، فَلَنْ يُفارِقَهُ غَباؤهُ!
¶ Though thou should bray a fool in a mortar among wheat with a pestle, yet his foolishness will not depart from him.