Hexagram 18Corruption

Corruption is the hexagram for the inherited mess — the long-running decay that the current actor did not cause and now has to repair. The discipline is to do the structural cleaning without turning the repair into a public indictment of the predecessors whose work created the rot.

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Corruption is the hexagram for the inherited mess. The character 蠱 depicts worms in a vessel — decay that has been working from inside for a long time. The hexagram statement is unusually generous: supreme success, advantage in crossing the great stream — provided the actor weighs the three days before the turning point and the three days after. The discipline is the repair of someone else's corruption without making the repair into a public punishment of the predecessors. Five of the six lines describe repairing the father's or the mother's affairs; the sixth withdraws from public service entirely. Read the position carefully.

The hexagram

蠱:元亨,利涉大川。先甲三日,後甲三日。

Corruption: supreme success. Advantage in crossing the great stream. Three days before the day jiǎ; three days after the day jiǎ. — Translation by YiGram Editorial from the classical Chinese

Kû indicates great progress and success (to him who deals properly with the condition represented by it). There will be advantage in (efforts like that of) crossing the great stream. (He should weigh well, however, the events of) three days before the turning point, and those (to be done) three days after it.

— James Legge, The Sacred Books of the East: The I Ching (1882), public domain.

The six lines

Click any line on the hexagram to read its passage. Use ↑ and ↓ after focusing the hexagram to step through the six positions.

Line 1Yin at the bottom初六

幹父之蠱,有子,考無咎,厲終吉。

Repairing the father's corruption. There is a son; the late father escapes blame. The position is perilous, but the end is fortunate.

The first SIX, divided, shows (a son) dealing with the troubles caused by his father. If he be an (able) son, the father will escape the blame of having erred. The position is perilous, but there will be good fortune in the end.

— Legge (1882)

Line 1 is the yin at the bottom of the lower trigram of wind — the first encounter with the inherited corruption, the moment when the actor recognises that the decay is now their work to address. 幹父之蠱 — repairing the father's corruption. The hexagram is precise about what makes the repair possible: 有子, there is a son — meaning the successor exists, is willing to do the work, and is competent to do it. The structural consequence is named immediately: 考無咎, the late father escapes blame. The act of repair by a capable successor is what retroactively protects the predecessor's reputation from being defined by the decay they left behind.

In a decision context this is the line of the new operator inheriting a structurally compromised position — the new CEO inheriting accounting irregularities, the new founder inheriting co-founder departures and unresolved cap-table issues, the new department head inheriting a years-old broken process. The temptation at line 1 is to publicly diagnose the inherited problem to establish that the new actor is not responsible. The hexagram is explicit that this move forfeits the line's logic. The peril is named — 厲, the position is dangerous — but the end is fortunate precisely because the capable repair is what lets the predecessor's name escape blame. Operators who learn to read line 1 cleanly do the work without the indictment; the fortune at the end is structural, not performative.

PostureInherited decay · repair without punishment

Corruption is the hexagram of structural inheritance. The trigram configuration is the whole image: Xun (wind) below, Gen (mountain) above — the wind blocked by the mountain, circulation stopped, the air going stale. The character itself depicts worms in a vessel: a container of food that has been sitting long enough for the decay to be working from inside. The hexagram is not about acute crisis; it is about long-running deterioration that the current actor did not cause. The Xiang compresses the picture into the four-character instruction: 山下有風,蠱 — wind beneath the mountain, Corruption. The noble person accordingly 振民育德 — stirs the people and nourishes virtue. Stirring is what restores circulation; nourishing virtue is what makes the restoration durable.

The hexagram statement is unusually generous and unusually conditional. 元亨,利涉大川 — supreme success, advantage in crossing the great stream. The conditions for the great fortune are exact: the actor must weigh 先甲三日,後甲三日, the three days before the day jiǎ and the three days after it. The classical reading is that jiǎ is the first stem of the ten-stem cycle — the point of beginning — and the instruction is to consider carefully both the conditions that produced the decay (the three days before) and the consequences that will follow the repair (the three days after). The hexagram refuses to let the repair be a reactive correction; it must be situated in the full arc of how the decay arose and how the cleanup will propagate. The five repair lines that follow read as the grammar of this calibrated cleanup.

Failure modesIndulgent viewing (line 4) · over-firm correction of the mother (line 2)

The dominant failure mode is the line-4 indulgent posture — the successor who refuses to repair the inherited corruption out of deference to the predecessor whose work produced it. The hexagram is explicit that this misreads filial loyalty: capable repair is what protects the predecessor’s name (line 1), and indulgent paralysis produces only , regret. The mirror failure mode is line 2’s over-firm correction of the relational decay — applying the same yang rigour that would correctly repair the father’s structural affairs to the mother position, where the texture of the decay is loyalties and accumulated indulgences rather than mismanagement. The hexagram is precise that 不可貞 — firm-correctness cannot be pushed to the extreme — because the rigorous method breaks the relational fabric it was meant to repair. Both failures share a root: an actor who cannot tell which texture of inherited decay they are facing, and who applies the wrong playbook to the line they have actually drawn.

Application & adjacentQuestion shape · Hexagram 19 pair · Succession-of-leadership repair

A note on the question shape this hexagram answers best. Corruption rewards questions framed around a specific inherited mess — taking over a department whose processes have decayed, becoming the new CEO of a company with structural issues that predate the appointment, inheriting a family business with grandfathered arrangements that no longer serve, picking up a long-running project whose original design has stopped fitting. It is less useful for questions about acute new crises or about whether to start something fresh; for that, re-read with Hexagrams 1 — Heaven — or 3 — Sprouting — depending on whether the question is about pure initiation or about the early-arc difficulty of getting started. Corruption presumes the decay is already in place and the actor's question is whether and how to repair it.

The canonical adjacent reading is Hexagram 19 — Approach — the immediate successor in the King Wen sequence and Corruption’s structural complement. Where Hexagram 18 names the cleanup of inherited decay, Hexagram 19 names the approach of new influence — the window when authority advances and the moment is open for action. Read together, the pair is the I Ching’s instruction for the early arc of a succession or turnaround: in 18 you do the structural repair that the predecessor’s era left undone, and in 19 you advance into the new configuration that the repair has made possible. The Xiang’s 振民育德 — stirring the people and nourishing virtue — is the through-line that lets the pair compose. The same noble person who restores circulation in 18 is the one whose nourished virtue carries the approach in 19.

The operational centre of the hexagram is the contrast between line 1 and line 4. Line 1 is the capable successor whose repair retroactively protects the predecessor’s reputation; line 4 is the indulgent successor whose non-repair compounds the decay and produces the regret that line 1 would have prevented. The decision-relevant move is to read which line the actor is actually drawing. If you are early in the inheritance and the corruption is fresh, line 1 is the instruction: take on the repair with the capable-son posture, and trust that the structural cleanup is what protects the predecessor. If you are tempted to leave the inherited mess undisturbed out of deference, line 4 is the warning: that posture is not loyalty; it is the failure mode the hexagram was written to name.

Sources

  • Classical text of the Yijing (周易) — hexagram and line statements (卦辭 / 爻辭) from the received Zhou-dynasty edition. Public domain.
  • James Legge, The Sacred Books of the East, Vol. XVI: The Yi King, Oxford University Press, 1882. Public domain.
  • Zhu Xi (朱熹), Zhouyi Benyi (周易本義), 1188. Public domain.
  • Wang Bi (王弼), Zhouyi Zhu (周易注), 3rd century. Public domain.
  • Bushi Zhengzong (卜筮正宗), Qing-dynasty divinatory manual, 1709. Public domain.
  • Tuan Zhuan (彖傳) and Xiang Zhuan (象傳), two of the Ten Wings (十翼). Public domain.
  • Bradford Hatcher, Yijing Hexagram Names and Core Meanings (Version 12.1, 2011). © Bradford Hatcher, 2011. Reproduced under the author’s explicit permission to redistribute his work intact, with copyright notice; this page quotes the “Key Words” subsection only and links readers to the full original for the longer notes. Bradford Hatcher (d. June 2020).

All Chinese-to-English translations on this page are by YiGram Editorial, working directly from the classical Chinese. We do not reuse third-party modern English translations of any of the listed Chinese sources. Read the full source policy in the methodology page.