Thunder above, wind below: the two most changeable things in the system, in a hexagram about what lasts. Heng argues that duration is not stillness but a pattern of movement that holds its shape.
Thirty-second in the King Wen order. The Sequence places it after Influence: the rule for a married pair is that their union should last, and heng is the name for long continuance.
The Judgement runs roughly: Heng. Things go through. No blame. It pays to hold to this. It is worth having somewhere to go.
The last clause is the one that stops this being a hexagram about staying put. Duration is affirmed, and then the text immediately says movement is worthwhile. Those sit together on purpose. What endures in this system is not something motionless; it is something that keeps going in a consistent direction. The phrase about no blame is also doing work: it is the book's formula for a situation where nothing has gone wrong, which is not the same as a situation where something good has happened. Heng is being described as sound rather than fortunate.
The Image: thunder and wind. The noble person stands firm and does not change direction.
The pairing is the argument. Thunder and wind are the two most transient things the system has, and the Image uses them for permanence. Neither is a substance; both are patterns that recur. What is recommended for conduct follows exactly: not stillness, but a direction that does not get revised. A person can be extremely busy and still satisfy this instruction, and a person can be completely inactive and fail it. The test is whether the direction stays the same, not whether the activity stops.
Heng means constancy, or duration, and the hexagram is the inverse of the one before it. Turn Influence upside down and you get this. The sequence puts attraction first and endurance second, which is a claim about how the two relate: what draws people together and what keeps them there are different mechanisms, and the book treats the second as the harder subject.
The figure is wind below, thunder above. Both are movement, and neither is a thing. That is the hexagram's whole position on permanence. What lasts is not the object but the pattern, in the way that a river persists while no particular water does. Duration here is a form of activity rather than the absence of it, which is why the Judgement can recommend having somewhere to go without contradicting itself.
The line texts are unusually severe about the failure modes, and there are two of them, at opposite ends. The bottom line describes demanding permanence too early and too deeply, and calls it misfortune. The top line describes restlessness made permanent, and calls that misfortune too. What changes with the question: asked whether something will last, the hexagram declines to forecast and describes what lasting requires. Asked whether to persist, it asks what exactly you would be persisting in.
In a relationship question Heng is the long middle, after attraction has done its work and before anything is settled. It describes what keeps a bond in existence once novelty is no longer supplying the energy, and the answer it gives is consistency of direction rather than intensity of feeling.
The first line is the warning most relevant here: pressing for permanence too deeply and too early, and the verdict is misfortune. Demanding guarantees at the start is named as a failure. The fifth line, which is favourable for one party and unfavourable for the other, is a piece of bronze-age social assumption rather than wisdom, and it should be read as evidence about the period that produced it.
At work Heng is the long project, the maintained system, the role held for years. It is about the discipline of continuing rather than the excitement of starting, and the book is clear that these are different capacities.
The fourth line is a single blunt phrase: no game in the field. Someone is hunting where there is nothing to catch. Persistence applied in the wrong place produces nothing at all, and the line offers no consolation about effort. That is the hexagram's necessary counterweight: constancy is a virtue only when the direction is right, and Heng contains no mechanism for telling you whether yours is. Nothing here forecasts your job.
In a money question Heng describes arrangements that persist: the standing commitment, the regular payment, the habit that has been running long enough to be invisible. The hexagram is favourable toward consistency and says nothing about amounts.
What it will not do is distinguish a good long-running arrangement from a bad one. The fourth line is the relevant caution, describing effort spent where there is nothing to be had. A commitment that has continued for years has proved only that it continued. Whether it is still worth what it costs is a question for your records and for someone qualified to look at them, and this text has no opinion on it.
Name the direction, not the outcome, and then check that this month's activity actually points at it. Do it today. Heng's failure is not stopping; it is continuing in a direction nobody has restated for a long time. Write the direction in one sentence. If you cannot, that is the finding, and it explains more than any amount of further effort would.
Yin in a yang place, incorrectly placed, at the very bottom. The text describes seeking duration too deeply, and gives misfortune with nothing gained. A weak line at the start demanding permanence is asking for a guarantee before anything has been established. The fault is not the wish for something to last; it is the timing, and the depth of the demand at a point where there is no foundation for it. Changing it produces Hexagram 34, The Power of the Great.
Yang in a yin place, so not correctly placed, but central. The text is two characters: remorse disappears. That is the entire line, and it is one of the shortest in the book. Centrality is doing all the work here. A strong line in the wrong position would normally attract a warning, and instead the text simply cancels the regret, because being in the middle is enough to hold the position. Changing it produces Hexagram 62, Preponderance of the Small.
Yang in a yang place, correctly placed, and given the harshest verdict. Not giving duration to your character; someone brings you disgrace; persisting brings humiliation. This line is quoted in the Analects, where Confucius uses it to make a point about inconstancy, which makes it one of the few places where a classical Chinese philosopher cites this book directly. Correct placement offers no protection against being unreliable. Changing it produces Hexagram 40, Deliverance.
Yang in a yin place, incorrectly placed, and the text is four characters: no game in the field. No verdict, no explanation. Someone is hunting in the wrong place and there is nothing there. The line is the hexagram's check on itself, since a book recommending constancy needs somewhere to say that constancy in the wrong direction produces exactly nothing. It does not say to stop, only that this ground is empty. Changing it produces Hexagram 46, Pushing Upward.
Yin in a yang place, not correctly placed but central. Giving duration to one's character and holding to it: good fortune for a wife, misfortune for a husband. The same conduct receives opposite verdicts depending on who is doing it. That is not a subtle observation about temperament; it is the social order of the period stated plainly, in which constancy was required of one party and insufficient in the other. Changing it produces Hexagram 28, Preponderance of the Great.
Yin in a yin place at the top, correctly placed, and the verdict is misfortune anyway. The text describes duration in agitation: restlessness that has itself become the permanent condition. This is the exact inversion of what the hexagram recommends, and it is placed at the top because that is where a quality goes wrong by excess. Someone constantly in motion looks committed and has no direction at all. Changing it produces Hexagram 50, The Cauldron.
The lower trigram is Xun, Wind; the upper is Zhen, Thunder. Both are movement, which is the joke and the argument at once: the hexagram of permanence is built entirely from things that do not stay. Zhen is the eldest son and Xun the eldest daughter in the family scheme the Ten Wings use, so the pairing was also read as a marriage, with the older generation's roles properly arranged.
The nuclear hexagram, from lines two to five, is Hexagram 43, Breakthrough, a figure about a decisive rupture. That is an odd thing to find inside constancy, and it is informative. What holds a long thing together, structurally, is a readiness to break with something, which is a more accurate account of endurance than most descriptions of it manage.
The inverse is Hexagram 31, Influence, immediately before it: the pair that opens the lower canon. The opposite, every line reversed, is Hexagram 42, Increase. Set against Heng, Increase describes gain that arrives from outside, while Heng describes what holds without anything being added.
The Zhou oracle layer, roughly ninth century BCE, provides the terse line texts: no game in the field, remorse gone, disgrace brought by someone. These are hunting and household observations with verdicts attached, and several of them are among the shortest statements in the whole book.
The third line has an unusual afterlife. It is quoted in the Analects, where Confucius cites the phrase about a person who gives no duration to their character, and adds a remark of his own. That citation is one of the earliest datable references to this text by a named figure, and it shows the book already functioning as a source of moral authority rather than only as an oracle.
The Ten Wings, compiled between about the fourth and second centuries BCE, supplied the Image with its instruction about not changing direction, and the family scheme in which the trigrams are read as household members. The Song commentators, Cheng Yi in particular, developed Heng into an account of constancy as a moral discipline.
James Legge's 1882 English is public domain and translates the name as continuance. Richard Wilhelm's German of 1924, into English by Cary Baynes in 1950, gives Duration, which is the version most readers meet. The fifth line, with its opposite verdicts for wife and husband, is handled with visible discomfort in both, and it is better read as a record of Zhou social arrangements than as counsel.
Heng is read as a promise that something will last. It is not a forecast and it contains no timeline. What it describes is the set of conditions under which things persist, and it spends four of its six lines on ways that persistence fails. Handing this hexagram to someone as reassurance about a relationship or a job is reading the title and stopping.
The second misreading turns constancy into stillness. Both trigrams are movement; the Image says do not change direction, not do not move. This matters practically, because people who receive Heng often conclude they should sit tight, when the Judgement explicitly says it is worth having somewhere to go. Duration in this text is a maintained trajectory, and sitting still is one of the ways to lose one.
The third is the fifth line, and it is the uncomfortable one. Constancy is called good fortune for a wife and misfortune for a husband. Modern treatments either omit it, reverse it quietly, or reinterpret it as a comment on receptive and active principles. It is more honest to say what it is: a Zhou-era text with Zhou-era assumptions about who owes constancy to whom. The hexagram remains useful. That line is a historical artefact, and dressing it up as timeless wisdom does the reader no favours.
Put a real question to the coins.