אָדָ֣ם עָ֭רוּם כֹּ֣סֶה דָּ֑עַת וְלֵ֥ב כְּ֝סִילִ֗ים יִקְרָ֥א אִוֶּֽלֶת׃
精明人隱藏知識；愚昧人的心卻宣揚愚妄。
Rashi
A cunning man conceals knowledge Even in his wisdom, he is discreet—he surely conceals words of foolishness; but the heart of the fool announces foolishness aloud.