Charles Ellicott Commentary Proverbs 14:33

"Wisdom resteth in the heart of him that hath understanding; But [that which is] in the inward part of fools is made known." — Proverbs 14:33 (ASV)

But that which is in the midst of fools is made known.— “Wisdom” is the subject of this as of the former half of the verse. Wisdom rests in the heart of him that hath understanding; he does not care to drag it out and exhibit it, but the fool cannot keep to himself anything which he thinks he knows.