Proverbs 15:2 · Bible study
Proverbs 15:2 Commentary: Making Knowledge Good
Hebrew · 10 what the commentators say
Meaning in one sentence
What does it mean for the wise tongue to make knowledge good? Hebrew grammar, contrast with the fool's gushing folly, and practical wisdom for measured speech.
Research Summary
- Meaning: The wise person’s speech makes knowledge attractive and useful; the fool’s speech uncontrollably pours out folly.
- Key words: Teitiv (Hiphil of yatav, to make good, do well, adorn); yabi‘a (from nava, to bubble up, gush forth, belch out).
- Main debate: The nuance of “makes good”, whether it means to use knowledge correctly (Clarke, Gill) or to make it attractive/commendable (Cambridge, Lange). Both are present in the Hebrew.
- Theological theme: Stewardship of speech as an outflow of wisdom that fears the Lord.
- Best use: Teaching on communication, self-control, and the power of words; contrasting wise and foolish speech patterns.
Translation Comparison
BSB Berean Standard Bible 2020
The tongue of the wise commends knowledge, but the mouth of the fool spouts folly.
WEB World English Bible 2000
The tongue of the wise commends knowledge, but the mouths of fools gush out folly.
KJV King James Version 1769
The tongue of the wise useth knowledge aright: but the mouth of fools poureth out foolishness.
ASV American Standard Version 1901
The tongue of the wise uttereth knowledge aright; But the mouth of fools poureth out folly.
YLT Young's Literal Translation 1898
The tongue of the wise maketh knowledge good, And the mouth of fools uttereth folly.
Darby Darby Bible 1890
The tongue of the wise useth knowledge aright; but the mouth of the foolish poureth out folly.
Douay-Rheims Douay-Rheims Bible 1899
The tongue of the wise adorneth knowledge: but the mouth of fools bubbleth out folly.
Translations in other languages (10 available)
La lengua de los sabios adornará la sabiduría: mas la boca de los necios hablará sandeces.
A língua dos sábios faz bom uso da sabedoria, mas a boca dos tolos derrama loucura.
La langue des sages rend la science aimable,
Der Weisen Zunge macht die Lehre lieblich; der Narren Mund speit eitel Narrheit.
De tong der wijzen maakt de wetenschap goed; maar de mond der zotten stort overvloediglijk dwaasheid uit.
La lingua dei savi è ricca di scienza, ma la bocca degli stolti sgorga follia.
Język mądrych zdobi umiejętność; ale usta głupich wywierają głupstwo.
Язык мудрых сообщает добрые знания, а уста глупых изрыгают глупость.
智慧人 的舌 善發 知識；愚昧人 的口 吐出 愚昧。
Knowledge is dropping from the tongue of the wise; but from the mouth of the foolish comes a stream of foolish words.
Verse in Context
Original Language (Biblical Hebrew)
Old Testament · Biblical Hebrew · Proverbs 15:2
Source: STEPBible TAGNT/TEHB (CC-BY 4.0). Click or tap a morphology code to see the full parsing.
Scholars' Consensus
The commentators agree that Proverbs 15:2 contrasts intentional, edifying speech with the fool's uncontrolled outpouring. The Hebrew phrase teitiv da‘at (she makes knowledge good) uses the Hiphil of yatav, a causative verb meaning to do well, to make attractive or right. Gill calls it using knowledge “well” so that it becomes beautiful and lovely. Barnes says it makes knowledge “goodly,” commending it. The Cambridge Bible notes the phrase means to turn knowledge to good account, like a skilled musician playing well. The fool's mouth yabi‘a (gushes forth), from nava, to bubble up like a spring (Gill, Wesley). The contrast is not between speaking and silence, but between speech that dresses knowledge in its best light and speech that spews folly without filter. Clarke presses the difficulty: the wise must know when, what, and how to speak. All traditions agree this verse praises measured, discerning speech and warns against reckless talk.
How settled is the interpretation?
Interpretive difficulty: Low
What is clear: Both clauses in the verse strongly contrast two kinds of speech: the wise person’s intentional, edifying use of knowledge versus the fool’s uncontrolled outpouring of folly – a contrast that all traditions recognize and apply to daily life.
What Scholars Agree and Debate
| Topic | Agreed | Debated |
|---|---|---|
| The meaning of ‘makes knowledge good’ (teitiv da‘at) | All traditions agree the verse distinguishes good, wise speech from foolish speech. The Hiphil verb indicates intentional, positive use of knowledge. | Some commentators emphasize ‘using knowledge aright’ (Clarke, Gill) while others focus on ‘making knowledge attractive’ (Cambridge, Lange). These are complementary, not contradictory. |
| The contrast between tongue and mouth | All see tongue (singular) vs. mouth (singular/plural) as poetic variation, both referring to speech. | Minimal debate; some note the singular 'tongue of the wise' vs. plural 'mouths of fools' may imply collective folly, but not strongly supported. |
| Identity of the ‘wise’ and ‘fools’ | The wise are those who fear the Lord and live prudently; fools are morally deficient, not merely unintelligent (consistent with Proverbs’ categories). | No substantive debate across traditions. |
Historical & Cultural Context
Proverbs 15:2 sits in a collection of sayings about speech (chapters 10, 22). The immediately surrounding verses reinforce the theme: a gentle answer turns away wrath (v.1), a gentle tongue is a tree of life (v.4), and the righteous heart studies how to answer (v.28). In the ancient Near East, the wise person (chacham) was not merely intelligent but practiced in social and moral skill, knowing when to speak before a king, a neighbor, or an adversary. The tongue and mouth are metonyms for character and influence.
The Hebrew verb yatav in the Hiphil appears elsewhere for making music well (Isa 23:16, to strike the harp well) or walking merrily (Isa 30:29). So the wise person's speech executes knowledge with artistry, it fits the occasion and audience. The fool, by contrast, is described with a verb that the lexical evidence shows means to gush, bubble, or belch forth (H5042). This word can describe a fountain (Ps 59:7, “they spew with their mouth”) or a fermenting liquid. The fool does not aim or measure; his words pour out continuously like water from a broken pipe.
Wisdom literature across the ancient world valued restraint in speech. Egyptian Instructions of Amenemope, for example, praise the “truly silent” person who weighs words. Proverbs shares this ethos but grounds it in the character of God, who sees all (v.3). The wise person speaks not only for social success but from fear of the Lord (1:7), knowing that words carry moral weight.
Textual Notes
The supplied sources note no significant textual variants for Proverbs 15:2. The differences among English translations (e.g., ‘commends knowledge’ vs. ‘useth knowledge aright’) reflect interpretive choices for the Hebrew phrase teitiv da‘at, not manuscript variation. The consonantal text (ותיטב דעת) is stable across the Masoretic tradition.
Reception History
Proverbs 15:2 has been a key text in Christian teaching on the tongue and discretion. Early monastic traditions used it to justify rules about silence and measured speech. The Reformers (Calvin, Luther) occasionally cited it in sermons on godly conversation. In the Puritan era, verses like this were woven into practical guides for daily speech, John Bunyan’s works echo its contrast. Modern commentators continue to apply it to communication in homes, workplaces, and churches. The verse is also memorized in many Bible-reading plans and used in marriage and parenting resources. Its enduring appeal lies in its concrete, memorable picture: the wise make knowledge good, while fools simply gush.
Preaching This Verse
Three-point outline
- The wise make knowledge attractive. The Hebrew verb teitiv (Hiphil of yatav) means to do well, to make good, to adorn. The wise do not just have knowledge, they present it in a way that commends it. As Gill and Barnes note, knowledge becomes “goodly” and “beautiful” through the tongue.
- Fools pour out folly uncontrollably. The verb yabi‘a (from nava) means to gush, bubble, belch forth. Fools have no filter. Where the wise weigh words (cf. Prov 15:28), fools simply release whatever is inside, and what is inside is folly (ivvelet).
- Speech is an act of stewardship. Knowledge is a trust. It can be used well or wasted. The wise steward uses knowledge to build up, teach, and comfort. The fool’s speech damages, annoys, or misleads because it lacks intentionality.
Five-point outline
- Wisdom requires timing, knowing when to speak (Prov 15:23; Clarke notes “when to speak, and when to be silent”).
- Wisdom requires content, speaking knowledge, not speculation or gossip.
- Wisdom requires tone, the tongue makes knowledge “good,” which includes grace and humility (Matthew Henry: “expressions of humility and love”).
- Folly lacks restraint, the fool does not consider consequences; his mouth runs ahead of his mind.
- Folly is abundant, “gush out” suggests volume without value, like floodwater compared to a channeled stream.
Illustration hooks
- At work: A colleague who always has an opinion, blurts out half-formed ideas in meetings, and leaves others frustrated. Contrast the coworker who waits, listens, then speaks a sentence that changes the discussion for the better.
- At the dinner table: A teenager who rolls out every complaint as soon as they walk in, vs. a child who has learned to find the right moment to ask for something important.
- Online: Social media posts that pour out emotion in ALL CAPS, compared to a carefully worded post that invites understanding.
Questions your congregation is asking
- How do I know when I'm being wise versus just holding back?
- What if I have good knowledge but I keep messing up how I say it?
- Is it always wrong to speak a lot? What about talking about faith with passion?
Leading a Discussion
This verse is about the quality, not quantity, of our speech. The wise person’s tongue makes knowledge good, it doesn't just dump information. The fool's mouth gushes folly without thought. As you read Proverbs 15:2, consider how your own patterns of speaking compare.
Discussion questions
- Observation: What words describe how the wise person uses knowledge in this verse? How does the fool speak? (Look at the two verbs in your translation.)
- Interpretation: Why do you think the Hebrew verb teitiv (makes good) could also mean “makes beautiful”? What does that add to your understanding of wise speech?
- Interpretation: Compare verse 2 with Proverbs 15:28, “The heart of the righteous weighs answers.” What does this reveal about what happens before the wise person speaks?
- Application: Think of a recent situation where you spoke quickly and regretted it. What would it look like to “make knowledge good” in that scenario instead?
- Application: The fool's words “gush out” (like a fountain). Is there an area of your life (social media, family arguments, work meetings) where you tend to gush rather than choose words carefully?
- Application (together): How can your small group help each other become better stewards of speech? Consider using Proverbs 15:2 as a group prayer prompt for the week, asking God to make your tongues “make knowledge good.”
- Going deeper: Read James 3:1, 12 about the tongue. How does this New Testament passage echo Proverbs 15:2?
Word Study
The key original-language words in this verse. Select any word for its full lexicon entry — meaning, every occurrence in Scripture, and related words.
Cross-References
Source: Treasury of Scripture Knowledge (TSK, public domain)
| Psalms 45:1 | For the Chief Musician. Set to “The Lilies.” A contemplation by the sons of Korah. A wedding song. My heart overflows with a noble theme. I recite my verses for the king. My tongue is like the pen of a skillful writer. |
| Psalms 59:7 | Behold, they spew with their mouth. Swords are in their lips, “For”, they say, “who hears us?” |
| Proverbs 12:23 | A prudent man keeps his knowledge, but the hearts of fools proclaim foolishness. |
| Proverbs 13:16 | Every prudent man acts from knowledge, but a fool exposes folly. |
| Proverbs 15:23 | Joy comes to a man with the reply of his mouth. How good is a word at the right time! |
| Proverbs 15:28 | The heart of the righteous weighs answers, but the mouth of the wicked gushes out evil. |
| Proverbs 16:23 | The heart of the wise instructs his mouth, and adds learning to his lips. |
| Proverbs 25:11 | A word fitly spoken is like apples of gold in settings of silver. |
Interlinear and lexical data from STEPBible (CC BY 4.0). Cross-reference data from OpenBible.info (CC BY 4.0). Commentaries are public domain.
For personal reflection
Read the devotional page — prayer, application, and "for families"
What the Commentators Say
10 public-domain commentaries, condensed into plain language.
Adam Clarke's Commentary Methodist/Wesleyan 1826
Clarke notes that using knowledge correctly involves knowing when to speak and when to stay silent as well as what to say and what to leave unsaid. He adds that finding the right way to speak depends on the situation subject and people involved.
Barnes' Notes on the Bible Protestant 1832
Barnes sharpens the contrast between two ways of speaking: one makes knowledge attractive through well-chosen words, while the other simply pours out folly. For him, the key is not just having wisdom but presenting it aright, so that speech commends truth rather than burying it.
Cambridge Bible for Schools and Colleges Anglican 1880
Christians who hold this view point to Proverbs 15:28 while others emphasize Proverbs 13:16. Both seek to be faithful to Scripture.
Geneva Bible Notes Reformed 1599
The Geneva note highlights the contrast between wise and foolish speech not just in content but in delivery: the wise apply their knowledge appropriately, while fools simply pour out nonsense without restraint.
Gill's Exposition of the Bible Baptist 1748
Gill emphasizes that wise speakers carefully adapt their knowledge to the right time, place, and person, making it helpful and attractive. Fools, by contrast, pour out their foolish notions recklessly and abundantly, like water gushing from a spring, with no regard for appropriateness.
Jamieson-Fausset-Brown Commentary Protestant 1871
Jamieson Fausset Brown notes that true knowledge is shown not by holding it alone but by using it correctly. This leads to generosity that pleases others rather than causing offense.
Keil & Delitzsch OT Commentary Protestant 1876
Keil and Delitzsch highlight the precise Hebrew vocabulary in this proverb: a gentle answer turns away the hottest anger (chemah, meaning glowing heat), not just ordinary wrath. They argue that the "bitter word" pains and wounds, not merely provokes anger, drawing on a root meaning of cutting or hurting.
Lange's Commentary Reformed 1857
Lange draws special attention to the Hebrew word meaning "makes good," noting its root sense of something bright and pleasing to the senses. The wise person presents knowledge in a way that is attractive and well-arranged, while the fool's mouth simply pours out folly in confused, repulsive noise.
Matthew Henry's Commentary Reformed/Presbyterian 1710
Henry draws a sharp contrast between two kinds of speech. The wise person uses his tongue to serve others with timely, humble instruction, making knowledge genuinely useful. The fool's mouth spews corrupt talk that either corrupts listeners or distresses the godly, revealing the evil within.
Wesley's Explanatory Notes Methodist/Wesleyan 1754
Wesley draws a distinction between two ways of speaking: one is to express knowledge prudently and gracefully, the other to pour it out like a fountain — plentifully, continually, and with vehemence. The wise person knows when each is appropriate.