Proverbs 12:23 Midrash

אָדָ֣ם עָ֭רוּם כֹּ֣סֶה דָּ֑עַת וְלֵ֥ב כְּ֝סִילִ֗ים יִקְרָ֥א אִוֶּֽלֶת׃

A prudent man concealeth knowledge; But the heart of fools proclaimeth foolishness.

Read midrashic interpretation of Proverbs 12:23: and classical rabbinic exegesis.