בְּלֵ֣ב נָ֭בוֹן תָּנ֣וּחַ חָכְמָ֑ה וּבְקֶ֥רֶב כְּ֝סִילִ֗ים תִּוָּדֵֽעַ׃
In the heart of him that hath discernment wisdom resteth; But in the inward part of fools it maketh itself known.
Rashi on Proverbs
Wisdom rests in the heart of an understanding man Heb. תנוח, it dwells and rests tranquilly; an expression of rest and tranquility.
Rashi on Proverbs
but in the midst of the fools it is known The little wisdom that is in his heart calls out. This parallels the Talmudic maxim (Baba Mezia 85b): “A coin in a bottle makes a sound of kish kish.”