Hexagram 21 噬嗑 changing to hexagram 18 蠱
Changing lines (counted from the bottom): 1, 2, 3, 4.
What to read
Four changing lines: read the two unchanged lines of the resulting hexagram; the lower one is the main one. (Rule set out by Zhu Xi in the Yixue qimeng.)
Hexagram 18 蠱, line 5
幹父之蠱，用譽。
The fifth line, divided, shows (a son) dealing with the troubles caused by his father. He obtains the praise of using (the fit instrument for his work).
Hexagram 18 蠱, line 6
不事王侯，高尚其事。
The sixth line, undivided, shows us one who does not serve either king or feudal lord, but in a lofty spirit prefers (to attend to) his own affairs.
The two hexagrams
Hexagram 21 噬嗑 — judgment
亨。利用獄。
Shih Ho indicates successful progress (in the condition of things which it supposes). It will be advantageous to use legal constraints.
Hexagram 18 蠱 — judgment
元亨。利涉大川。先甲三日，後甲三日。
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.
The changing lines of hexagram 21
| Line | Chinese | Legge |
|---|---|---|
| 1 | 屨校滅趾，无咎。 | The first line, undivided, shows one with his feet in the stocks and deprived of his toes. There will be no error. |
| 2 | 噬膚滅鼻，无咎。 | The second line, divided, shows one biting through the soft flesh, and (going on to) bite off the nose. There will be no error. |
| 3 | 噬昔肉，遇毒；小吝，无咎。 | The third line, divided, shows one gnawing dried flesh, and meeting with what is disagreeable. There will be occasion for some small regret, but no (great) error. |
| 4 | 噬乾胏，得金矢，利艱貞，吉。 | The fourth line, undivided, shows one gnawing the flesh dried on the bone, and getting the pledges of money and arrows. It will be advantageous to him to realise the difficulty of his task and be firm,—in which case there will be good fortune. |
English: James Legge (1882), public domain. Chinese: Zhou Yi.
Data: English Wikisource (Public domain texts; transcription CC BY-SA 4.0); Chinese Wikisource (Public domain texts; transcription CC BY-SA 4.0). Retrieved 2026-10-22.