Hexagram 18 of 64
Work on the Decayed
gu · 蛊
TL;DR
- ◈Hexagram 18, Work on the Decayed, is summarized by the Judgment: Work on What Has Been Spoiled has supreme success. It furthers one to cross the great water.
- ◈Its structure is Mountain above Wind; read the trigram interaction before treating it as a simple label.
- ◈Core keywords: repair, renewal, corruption, restoration.
By the Numbers
- #18
- King Wen Order
- Work on the Decayed in the 64-hexagram sequence.
- 2
- Trigrams
- Mountain above Wind.
- 6
- Lines
- Each hexagram is read from bottom to top.
Classical Context
Hexagram 18, Gǔ (蠱), is the hexagram of Decay — corruption that has accumulated through neglect, and the urgent work needed to set things right. Composed of Gèn (☶ Mountain) above and Xùn (☴ Wind) below: wind blows at the foot of the mountain, slowly eroding it. Corruption begins invisibly and grows silently until the structure crumbles.
This expanded note is adapted from the long-form hexagram draft as cultural and textual context; a live reading still depends on the question, changing lines, and the full transformation pattern.
Six-Line Theme Map
I Ching lines are read from the bottom upward. This map runs from the initial line to the top line so the Judgment, Image, and moving-line position can be read together.
- L1
初六 · 干父之蛊
Correcting father's decay — son's duty
- L2
九二 · 干母之蛊
Correcting mother's decay — gentle firmness
- L3
九三 · 干父之蛊
Correcting father's decay — some regret
- L4
六四 · 裕父之蛊
Indulging father's decay — shame
- L5
六五 · 干父之蛊
Correcting father's decay
- L6
上九 · 不事王侯
Not serving king or lord — noble retirement
Deep Reading
Decay as inherited work, not a curse
Gu names damage that has accumulated through neglect. The repeated language of correcting the father's or mother's decay points to inherited patterns: family habits, institutional debt, old decisions, and unexamined customs. The hexagram asks for responsibility without turning the reading into blame.
- •The problem is old enough to have roots, so surface fixes are unlikely to be enough.
- •Correcting paternal decay often calls for firm structural repair.
- •Correcting maternal decay calls for gentleness around sensitive dependencies.
- •The fourth line warns that indulging decay allows the damage to continue.
Before Jia and after Jia
The Judgment gives a timing instruction: three days before Jia and three days after Jia. It suggests that reform has two sides. Before action, investigate causes and prepare the field; after action, follow through so the old pattern does not return under a new name.
- •Preparation without action becomes delay.
- •Action without follow-through lets decay return.
- •The Image adds a social task: stir the people and cultivate virtue.
- •The top line shows that some people may finish the work by refusing corrupt service.
Reading Gu in a live question
- Inherited organizational problems
- Look for root causes, not only symptoms. Gu favors repair with preparation, accountability, and follow-through.
- Family or relationship patterns
- The text can point to inherited habits, but it should not become accusation. Use firmness and gentleness according to the sensitivity of the issue.
- Reform timing
- Prepare before the visible action and monitor after it. The repair is not complete when the announcement is made.
Source Notes
- Primary text
- This reading follows the Zhouyi Gu Judgment, Image, and line statements, especially before-and-after Jia timing, work on parental decay, indulging decay, and noble withdrawal.
- Zhouyi: Gu Judgment, Image, and line statements
- Method boundary
- Gu is a cultural and symbolic model for inherited dysfunction and reform. It should not be used as medical, legal, or family-system diagnosis.
- CosmicTao editorial method note
Interpretation
Yes, but repair is needed first. Fix the root cause.
Upper Trigram
Mountain
Lower Trigram
Wind
The Judgment (King Wen)
Work on What Has Been Spoiled has supreme success. It furthers one to cross the great water.
The Image
The wind blows low on the mountain: the image of Decay.
Keywords
FAQ
What is Hexagram 18 (Work on the Decayed)?
Work on What Has Been Spoiled has supreme success. It furthers one to cross the great water.
What is the geometric structure of Hexagram 18?
Hexagram 18 acts with the upper trigram Mountain and the lower trigram Wind.
What are the core themes of Work on the Decayed?
The core themes and meanings include: repair, renewal, corruption, restoration.