Hebrew · Midrash Rabbah (Hebrew, Torat Emet)
וְגַם בַּדֶּרֶךְ כְּשֶׁהַסָּכָל הוֹלֵךְ וגו', טִפְּשָׁא סָבַר דְּכָל עַמָּא טִפְּשִׁין כְּוָותֵיהּ, וְהוּא לָא יָדַע דְּהוּא טִפְּשָׁא וְכָל עַמָּא חַכִּימִין.
English · The Sefaria Midrash Rabbah (2022)
“Even when a fool walks on the way his heart is lacking; and he says to everyone that he is a fool” (Ecclesiastes 10:3). “Even when a fool walks on the way…” – a fool believes that all the people are fools like him, but he does not know that he is a fool and all the people are wise.