Heaven held inside a mountain. Da Xu is accumulated force under restraint: energy that is being stored rather than spent. The restraint is what makes the eventual release worth anything, and the text spends most of its length on the holding.
Twenty-sixth in the King Wen order. The Sequence places it after Innocence: once there is freedom from pretence something can be accumulated and held, and da xu is that great accumulating.
The Judgement runs roughly: Da Xu. It pays to hold to this. Not eating at home brings good fortune. It is worth crossing the great water.
The middle clause is the strange one and it is the most concrete. Not eating at home meant taking public office, being fed at the ruler's table rather than from your own fields. The text is saying that accumulated capacity is not for private use. Something has been built up, and the Judgement directs it outward into service rather than inward into comfort. Crossing the great water is the standard phrase for undertaking something serious and irreversible, so the hexagram is not counselling caution. It is counselling storage first, then a real commitment.
The Image: heaven inside the mountain. The noble person studies many sayings of the past and many deeds of former times, and builds up their character that way.
The image is deliberately impossible. Heaven cannot be inside a mountain; the point is the scale of what is being contained. What follows for conduct is unexpectedly specific and unusually practical: read history. The recommendation is that character is accumulated the way anything else is stored, by taking in a great deal over time from outside yourself. This is one of the few places in the book where the prescribed activity is plain study rather than a posture or an attitude, and it is worth noticing that the method is other people's experience rather than your own.
Da Xu means the great accumulation, or the great restraining, and the ambiguity is in the Chinese rather than in the translation. Xu covers both storing something up and holding something back, which turn out to be the same operation viewed from either end. Three yang lines are stacked at the bottom, pressing upward, and the mountain sits on top of them.
What the hexagram describes is force that is not being used yet. Not blocked, not wasted: held. The three strong lines below are the most concentrated energy the system has, and every structural feature of the upper trigram is arranged to keep them there a while longer. Read for a decision, this argues for delay, but specifically the kind of delay in which something is being built up rather than merely postponed.
The two animal lines in the upper half say how. A young bull is fitted with a board across its horns before the horns are dangerous; a boar is gelded rather than fought. Both describe managing a force early, at the point where a small intervention still works. This is a hexagram about preparation, and it does not moralise about the force being restrained. What changes with the question: asked about action, it says wait and prepare. Asked about capability, it says you have more than you are currently using.
In a relationship question this is a connection with real force in it that is deliberately not being acted on yet. Restraint that is not coldness. It can describe two people who both know what is there and are letting it accumulate rather than spending it early.
It also covers the less romantic version: something held back for reasons that are practical, or for reasons nobody has said out loud. The hexagram does not distinguish patience from avoidance, and the difference matters. Ask whether the delay has a condition attached that could actually be met. If there is no such condition, this is not accumulation, it is a stall wearing accumulation's clothes.
At work Da Xu is the period before the launch: capability being built, credentials accumulated, a case assembled before it is presented. The Judgement's instruction to eat away from home points at using what you have built in a public role rather than keeping it to yourself.
The third line is the working advice. A good horse pursuing others, daily practice at driving and defence, and then somewhere worth going. The sequence is training first, then movement. What the hexagram will not tell you is how long the accumulating phase should last, and that is exactly the question most people bring to it. The lines describe readiness; nothing in them dates it.
In a money question this is the hexagram of reserves. Something is being held rather than deployed, and the text treats that as correct for now. The first line is explicit about it: there is danger, and stopping is the advantageous move.
What the hexagram does not do is rate any particular holding as good or bad, and it is not a signal to buy, sell or wait on anything specific. Its actual content is about sequence: capacity is built before it is spent, and spending it early is the failure it describes. Any decision with a figure attached belongs to arithmetic and to someone who can see your circumstances.
Name the condition that ends the waiting, and write it down where you will see it. Da Xu is only accumulation if there is a point at which the stored thing gets spent; without that it is hoarding. Pick something checkable, a date or a milestone, not a feeling of readiness. It has to be a thing another person could verify. Readiness never arrives on its own.
Yang in a yang place, correctly placed, and the first of the three strong lines pushing up from below. The text is two clauses: there is danger, and it is advantageous to stop. Correct placement does not license movement here, because the restraint above has not been satisfied yet. This is the clearest instance in the hexagram of a line being right and still being told to wait. Changing it gives Hexagram 18, Work on What Has Been Spoiled, where the delay has gone on long enough to cause damage.
Yang in a yin place, so incorrectly placed, though central in the lower trigram. The text is a single image: the axle straps come off the wagon. The vehicle is not broken and nothing has crashed; it has simply been disconnected so that it cannot move. That is a considerable difference, and it is the reason this line carries no misfortune. Changing it produces Hexagram 22, Grace, where what is held back turns into something ornamental instead.
Yang in a yang place, correct, and sitting at the top of the lower trigram where the held energy finally has somewhere to go. The text turns practical: a good horse pursuing others, daily practice at driving and defence, and then it is worth having a destination. This is the first line permitted to move, and the permission comes with training attached. Changing it produces Hexagram 41, Decrease, where what is given up is given up deliberately.
Yin in a yin place, correctly placed, and the first of the two restraining lines above. A board is fixed across a young bull's horns. The animal is not injured and not broken; it is fitted with the restraint before its horns have grown enough to do harm. The text calls this great good fortune, and the reason is timing rather than force: a small intervention early does the work of a large one later. Changing it gives Hexagram 14, Possession in Great Measure.
Yin in a yang place, so not correctly placed, but central in the upper trigram and functionally the ruling line. The image is the tusk of a gelded boar. The tusk is still there and it is no longer a problem, because the animal's disposition was altered rather than its weapon removed. That is a more sophisticated idea than restraint: the force is redirected at the source. Changing it produces Hexagram 9, The Taming Power of the Small, the same operation at a fraction of the scale.
Yang in a yin place at the top, where in most hexagrams the quality has gone too far. Here it is the opposite: the restraint ends and the accumulated force is released. The text is short and unusually open, describing the open road of heaven, and adds that things go through. Everything the hexagram has been holding is now available. It is the only line in the figure with no caution attached. Changing it produces Hexagram 11, Peace.
The lower trigram is Qian, Heaven; the upper is Gen, Mountain. Three unbroken lines of pure creative force with a mountain sitting on them. Gen means stopping, and its function throughout the book is to arrest whatever is beneath it. Putting the strongest trigram under the one that halts things is the entire mechanism of this hexagram: maximum force, maximum restraint, and nothing wasted.
The nuclear hexagram, taken from lines two to five, is Hexagram 54, The Marrying Maiden, which is a much less comfortable figure. It describes entering a situation in a subordinate position with limited say over the terms. That is what sits inside the accumulation: the restraint is not self-imposed as freely as the surface suggests, and something is being submitted to.
The inverse is Hexagram 25, Innocence, this figure turned upside down. Read as a pair they are the book's two answers to the same question: act without calculating, or hold back and prepare. The opposite, every line reversed, is Hexagram 45, Gathering Together, where what accumulates is people rather than capacity.
The base layer is Zhou-era oracle material, in circulation by roughly the ninth century BCE. What survives from that stage in this hexagram is very concrete: a wagon with its straps off, a board on a bull's horns, a gelded boar. These are farm and household images, recorded by people for whom livestock management was ordinary knowledge rather than metaphor.
The philosophical reading is later. The Ten Wings, compiled between about the fourth and second centuries BCE, supplied the Image commentary that turns this hexagram into a recommendation to study history. That instruction is not in the oracle layer at all. It is a scholar's addition, and it tells you what the compilers valued.
The Song commentators pushed further. Cheng Yi in the eleventh century and Zhu Xi in the twelfth read Da Xu as moral self-cultivation, the storing up of virtue, and that reading dominates modern popular treatments.
In English, James Legge's 1882 version is the public domain scholarly baseline, dense and heavily footnoted. Richard Wilhelm's German of 1924, carried into English by Cary Baynes in 1950, is the version most readers have met, and it is considerably more interpretive than the Chinese warrants. The distinction matters here: the bull and the boar are ancient, the self-cultivation is medieval, and the psychological gloss is twentieth century.
The common reading is that Da Xu counsels patience, and patience is a virtue, so the hexagram is telling you to be good and wait. That flattens it. The text is not recommending patience as a character trait; it is describing a specific structural situation in which force is present and its release is being timed. Waiting when there is nothing accumulating is not this hexagram.
The second misreading is the animal lines. A board on a bull's horns and a gelded boar are frequently softened into gentle metaphors about self-discipline. They are not gentle. One is a physical restraint fitted to a working animal, the other is a permanent alteration to prevent aggression. The text is describing interventions that are real, early and irreversible, and reading them as encouragement to be mindful loses the point that something is actually being done to something.
The third is the nuclear hexagram, which almost no English treatment mentions. Inside this figure of dignified accumulation sits The Marrying Maiden, a figure about occupying a subordinate position on terms set by someone else. A reading that presents Da Xu purely as self-mastery has missed that the restraint may not be as freely chosen as it looks.
Put a real question to the coins.