Charles Ellicott Commentary Proverbs 12:23

"A prudent man concealeth knowledge; But the heart of fools proclaimeth foolishness." — Proverbs 12:23 (ASV)

A prudent man concealeth knowledge.—Until the right opportunity for bringing it forth presents itself; while the heart of fools proclaimeth foolishness, it cannot help blurting out and displaying its ignorance and folly, which it mistakes for wisdom.