to have good sense: to grasp a matter clearly and act on it skillfully, so that things turn out well
TranslatabilityPartialCertaintyStrong
This is the Bible's word for the kind of wisdom that is not just knowing facts but seeing how things really work and handling them well. It joins two ideas that English keeps apart: insight (perceiving what is true) and competence (acting on it successfully). A person who has this is not merely clever; they understand a situation and so deal with it the right way.
Because clear insight and skillful action tend to produce good results, the same word slides naturally from "understand" to "act wisely" to "succeed." That is why English Bibles render it both as "understand" and as "prosper," sometimes in the very same verse. The success in view is not luck or wealth for its own sake; it is the good outcome that follows from doing the wise and right thing.
The word also reaches forward: someone who has insight can give it to others, so it can mean to instruct or make wise. Across all these shades the core holds steady, which is why they belong to one word rather than several: to see clearly and to act accordingly.
Nuances
1ato understand, perceive, have insight into something
to lay crosswise: to set one's hands across each other
TranslatabilityDirectCertaintyObscure
In one place the same letters carry a completely unrelated meaning, having nothing to do with wisdom. When the dying Jacob blesses Joseph's two sons, he deliberately crosses his arms so that his right hand falls on the younger boy rather than the older. The narrator uses this word for that crossing of the hands.
Because it occurs only here, scholars treat it as a separate word that happens to be spelled like the common word for insight. Reading the wisdom sense into this verse would be a mistake: Jacob is positioning his hands, not being clever.
ties the good outcome directly to wise and right conduct: one prospers because one acted with insightJos 1:8
Both
both point to things turning out well, to a favorable result2Ki 18:7
Only prosper
in English implies material success or good fortune on its own, which can come by luck and need not flow from any wisdom
“consider”
Comparison data is not available for this English gloss yet.
“be wise”
Comparison data is not available for this English gloss yet.
“instruct”
Comparison data is not available for this English gloss yet.
How sakhal differs from similar Hebrew words
בִּיןto discern or distinguish, the act of telling things apart and seeing how they connect; sakal adds the note of acting skillfully on what one discerns
Names wisdom shown in prudent action and proven by its good outcome: the person who acts with insight succeeds and prospers in what they do.1Sa 18:5Jos 1:82Ki 18:7
Points to sharp discernment that sizes up a situation rightly and handles it skillfully, the practical grasp behind a wise move.1Ki 2:3Psa 41:1Pro 10:5
Both
Both describe the mind coming to understand and take instruction to heart, and Hebrew poetry sets them side by side as near-equivalents for growing wise.Deu 32:29Pro 21:11
Names the inner state of being or becoming wise itself: possessing wisdom as a settled quality that a person grows into, is taught, or is measured against others by.1Ki 4:31Pro 9:9Pro 13:20
Used to weigh how much wisdom someone holds, whether great, growing, or lacking, treating wisdom as a trait one can have more or less of.Job 32:9Ecc 2:15Zec 9:2
יָדַעto know by experience or acquaintance; sakal is the deeper grasp that lets one handle what is known
The verb runs all the way out to plain success: David came off well in everything Saul sent him to do, Hezekiah prospered wherever he went, and Joshua is promised the same if he keeps the law in view. None of that range can be claimed for a poem.1Sa 18:52Ki 18:7Jos 1:8
It also turns outward and hands the insight to somebody else, so that it is rendered "instruct" or "teach": God promises to show a person the way to go, the angel comes to give Daniel understanding, and God's good Spirit is given to teach Israel in the wilderness.Psa 32:8Dan 9:22Neh 9:20
Its subject is a living person, never a text or a tune: Eve saw the fruit as a way to gain insight, the young men taken to Babylon were skilled in every kind of learning, and God's servant is the one who will act with insight and be lifted high.Gen 3:6Dan 1:4Isa 52:13
Both
Both live in one range that English keeps apart, seeing clearly and doing well, and that doubleness is exactly why the psalm label is ambiguous: the verb covers grasping a matter and handling it skillfully, so a song called this may be one that teaches or one that is expertly made, and the single place the label stands inside a psalm is read both ways, as "sing praises with understanding" and as "sing a skillful song."Pro 1:32Ch 30:22Psa 47:7
In Hebrew they are the same written word, told apart only by where it sits: Psalm 53 carries it in the heading as a label, and then asks in its own second verse whether there is anyone with the sense to seek God, using the identical form for a person rather than a poem.Psa 53:0Psa 53:2Psa 14:2
Psalm 32 keeps the two side by side and shows the family sense at work: the heading wears the label, and then the psalm itself uses the verb for God teaching a person the way to walk.Psa 32:0Psa 32:8
Maskil is a tag fixed above the poem, not anything the poem itself says, so whatever it claims is claimed about the whole song before a reader reaches the first line.Psa 32:0Psa 74:0
It stands among the other notes about music and performance in a psalm heading, beside the words for a song, for a psalm sung to strings and for the choir leader, which is why many read it as a direction for how the piece was to be sung rather than a claim about its content.Psa 88:0Psa 54:0
What the label actually claimed cannot be recovered from the psalms that carry it, because those psalms share nothing: a royal wedding song, a long lesson drawn from Israel's history and a prayer from a cave all wear the same word.Psa 45:0Psa 78:0Psa 142:0
Names the inner act of understanding and prudence itself, having insight, paying careful attention, grasping a matter, quite apart from any outcome of success.Gen 3:6Psa 14:2Dan 9:22
Describes a person who behaves wisely and skillfully, conducting themselves with discretion, a wise servant or a prudent ruler, where the focus is the wise conduct rather than the result.1Sa 18:51Sa 18:14Pro 17:2
Used for teaching or giving insight to another, making someone wise, instructing them so they understand.Psa 32:8Neh 9:20Dan 9:13
Both
Both can mean to prosper or succeed, and Joshua 1:8 pairs them for exactly this: meditating on the law so that one makes the way prosperous (צָלַח) and has good success (שָׂכַל). The difference is the angle: צָלַח names the thriving outcome, שָׂכַל the wise dealing that brings it about.2Ch 31:211Ki 2:3
Both attach to a king or leader whose reign goes well, but from different sides: with צָלַח Hezekiah's rebellion and Cyrus's commission simply come off, while with שָׂכַל the success is credited to acting wisely.Isa 48:152Ki 18:7
Used when the Spirit of the LORD comes powerfully and suddenly over a person, rushing upon Samson, Saul, or David so that they act with God-given force. This is a meaning שָׂכַל never carries.Jdg 14:61Sa 10:61Sa 16:13
Describes a journey, errand, or venture turning out well, the road or undertaking itself coming off successfully, with no implication that wisdom produced the result.Gen 24:21Gen 24:42Neh 2:20
Marks whether a plan or scheme will work at all, often in the negative: a venture that will not come off, a planted vine that will not thrive, a man who will not get anywhere.Num 14:41Ezk 17:9Jer 22:30
sakhal in the other biblical languages
συνίημιGreek“to understand”the Greek word for putting things together in the mind, to comprehend or understand; it covers the insight side of sakal but not its drift into prospering
What scholars say about sakhal
The standard lexica (BDB, HALOT, DCH) treat the dominant verb as one root whose hiphil ranges over giving attention, gaining insight, acting with prudence, and the resulting success or prosperity, plus a causative "give insight, instruct." The semantic unity is the exercise of effective insight, which is why "act wisely" and "prosper" shade into each other (so 1 Sam 18:5-15; Josh 1:7-8; Isa 52:13). TDOT (Koenen) surveys the wisdom-literature and historiographic uses and the maskilim of Daniel (Dan 11:33, 35; 12:3, 10). The Genesis 48:14 occurrence is widely taken as a separate homonym, "to lay crosswise," listed apart in BDB and HALOT; a minority retains the "act knowingly" sense there.
Where scholars disagree about sakhal
Whether the form in Jacob's blessing (Genesis 48:14) is the ordinary verb for insight used in the sense "act knowingly, deliberately," or a separate homonym meaning "to lay the hands crosswise."
majorityA separate homonym, "to lay crosswise," matching the verse's description of Jacob crossing his arms.; BDB, s.v. שׂכל II; HALOT, s.v. שׂכל II
minorityThe ordinary verb in the sense "he acted knowingly," describing Jacob's deliberate intent rather than the physical crossing.; DCH, s.v. שׂכל
Sources
BDB, s.v. שׂכלlexicon
HALOT, s.v. שׂכל I and IIlexicon
DCH, s.v. שׂכלlexicon
K. Koenen, "שׂכל śākal," in TDOT vol. 14theological-dictionary