A prudent man conceals knowledge, but the heart of fools proclaims folly.
English Standard Version (ESV)
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Proverbs 12:23
What does Proverbs 12:23 mean?
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Proverbs 12:23
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The "prudent" person doesn't just hoard knowledge; they wisely discern when and how to share it, waiting for the right moment. Conversely, the fool's "heart proclaims folly" because their foolishness is so obvious and uncontrollable, it bursts forth without regard for occasion or impact.
A prudent man conceals knowledge, but the heart of fools proclaims folly.
English Standard Version (ESV)
This verse sits within a collection of contrasts, where wise actions are set against foolish ones. It follows immediately after verses discussing the value of truthfulness and the dangers of gossip, framing the idea of "knowledge" here not as hidden secrets, but as truth that should be spoken at the right time. The verse then contrasts the prudent person's thoughtful restraint with the fool's impulsive, often ignorant, pronouncements.
Have you ever wished you’d said something different? Or maybe stayed quiet when you really wanted to speak up? This verse sheds light on when and how wisdom is best shared.
The verse contrasts two approaches to knowledge. The 'prudent' person, meaning wise and discerning, doesn't blurt out everything they know. Instead, they hold onto their knowledge, waiting for the opportune moment to speak.
This isn't about hoarding wisdom or being secretive for the sake of it. It's about discernment. True wisdom understands that timing, context, and audience matter. Sometimes, speaking too soon or without consideration can cause more harm than good. By concealing knowledge until the right moment, a wise person can ensure their words are heard, understood, and have a positive impact, rather than being wasted or misunderstood.
Why do some people seem to constantly reveal their own ignorance or foolishness, even when they think they're being clever?
The second half of the verse paints a vivid picture of fools. Their 'heart proclaims folly.' This means that their inner foolishness isn't contained; it spills out uncontrollably through their words and actions.
A fool's mind is often filled with shallow or misguided thoughts, and they lack the discernment to keep them private. They speak without thinking, eager to share what they believe is wisdom but is actually foolishness. This constant broadcasting of folly exposes their true character and lack of understanding, often to their own detriment.
Understand the original words
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'arum · Hebrew Adjective
Characterized by spiritual discernment, wisdom, and careful judgment in decision-making. It involves the skillful application of divine truth to everyday life.
kesil · Hebrew Noun
A person who is morally or spiritually deficient, lacking the fear of God, and rejecting wisdom. In Proverbs, the fool is not merely unintelligent, but is defined by their refusal to live according to divine instruction.
iwweleth · Hebrew Noun
Moral insanity or lack of understanding that stems from a refusal to acknowledge God. It represents an emptiness of heart and speech that is contrary to divine wisdom.
This verse offers a similar thought, stating that wise people store up knowledge, highlighting the contrast between thoughtful retention and impulsive speech found in Proverbs 12:23.
Ecclesiastes 10:3This passage directly parallels the idea that a fool's foolishness is evident to all because his inner thoughts (heart) are so readily displayed through his speech.
James 1:19This New Testament passage urges believers to be 'quick to hear, slow to speak, slow to anger,' a principle that underlies the wisdom of 'concealing knowledge' until the opportune moment.
Matthew 7:6Jesus' teaching not to cast pearls before swine emphasizes discernment in sharing valuable 'knowledge,' aligning with the prudent person's discretion mentioned in Proverbs 12:23.
pulpitProverbs 12:23: "A prudent man concealeth knowledge: but the heart of fools proclaimeth foolishness."
Verse 23. - A prudent man concealeth knowledge (ver. 16; Proverbs 10:14). He is not wont to utter unadvisedly what he knows, but waits for fitting opportunity, either from humility or wise caution. Of course, in some cases reticence is sinful. The LXX., reading the passage differently, renders, "A prudent man is the seat of intelligence (θρόνος αἰσθήσεως)." The heart of fools proclaimeth foolis…
ellicottProverbs 12:23: "A prudent man concealeth knowledge: but the heart of fools proclaimeth foolishness."
(23) A prudent man concealeth knowledge.— Till the right opportunity for bringing it forth presents itself; while “the heart of fools proclaimeth foolishness,” cannot help blurting out and displaying its ignorance and folly, which it mistakes for wisdom.
The "prudent" person doesn't just hoard knowledge; they wisely discern when and how to share it, waiting for the right moment. Conversely, the fool's "heart proclaims folly" because their foolishness is so obvious and uncontrollable, it bursts forth without regard for occasion or impact.
This verse sits within a collection of contrasts, where wise actions are set against foolish ones. It follows immediately after verses discussing the value of truthfulness and the dangers of gossip, framing the idea of "knowledge" here not as hidden secrets, but as truth that should be spoken at the right time. The verse then contrasts the prudent person's thoughtful restraint with the fool's impulsive, often ignorant, pronouncements.
This verse sits within a collection of contrasts, where wise actions are set against foolish ones. It follows immediately after verses discussing the value of truthfulness and the dangers of gossip, framing the idea of "knowledge" here not as hidden secrets, but as truth that should be spoken at the right time. The verse then contrasts the prudent person's thoughtful restraint with the fool's impulsive, often ignorant, pronouncements.
"A prudent man conceals knowledge, but the heart of fools proclaims folly." — The "prudent" person doesn't just hoard knowledge; they wisely discern when and how to share it, waiting for the right moment. Conversely, the fool's "heart proclaims folly" because their foolish…
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Last reviewed October 2026