Yi means meaning or rightness and li means principle or pattern, so the compound names a reading concerned with what the text means and the principles it expresses. It is the standing contrast to Xiangshu, symbol-number, which reads the hexagrams as a formal system correlated with calendars and phases.

A third-century commentator who wrote on both the Laozi and the Book of Changes and set the terms for all later meaning-principle interpretation. His argument that images are a means to meaning and should be discarded once meaning is grasped ended the dominance of Han numerology. He died at twenty-three.

How did Cheng Yi and Zhu Xi differ?

Cheng Yi read the Changes as pure ethics and had little interest in its use as an oracle. Zhu Xi agreed with his philosophy but insisted the book had originated as a divination manual and that ignoring this misreads its language. Zhu Xi restored the yarrow procedure while keeping the moral interpretation, and the combined Cheng-Zhu position became orthodoxy.

What tools does the school use to read a hexagram?

Only what is inside the figure: which line rules it, whether each line is correct for its place, whether it is central, whether it corresponds with the line three places away, whether it rides on or is supported by its neighbours, and what the two trigrams do to one another. All of these come from the Ten Wings rather than from external correlation.

Why did this reading become so dominant?

Two decisions. Kong Yingda chose Wang Bi's commentary as the base for the Tang official subcommentary, which determined what got copied. Then in 1313 the Cheng-Zhu reading became the basis of the civil service examinations, and stayed there until 1905, so every educated official in China, Korea and Vietnam learned the text through it.

Is Yili opposed to divination?

Cheng Yi effectively was; Zhu Xi was not. The school's core claim is about interpretation rather than about whether one may consult the text. Zhu Xi's position, that you cast the hexagram properly and then read the result for its principle rather than by computing branches and phases, is the mainstream one.

Does the Western I Ching come from this school?

Largely yes. Legge worked from the orthodox Qing edition and Wilhelm studied with a scholar in that tradition, so the moral and philosophical framing familiar to English readers, including the recurring figure of the superior person, is Cheng-Zhu interpretation. The symbol-number methods used by working Chinese diviners were never transmitted westward in the same way.

What is the Taijitu shuo?

Zhou Dunyi's very short essay explaining a diagram of the Supreme Polarity, deriving yin and yang, the Five Phases and the ten thousand things from an undifferentiated source. It is barely two hundred characters long and became the cosmological foundation of Neo-Confucianism, drawing its key term from the Great Treatise of the Changes.

A seventeenth-century thinker who wrote extensively on the Changes while in hiding after the Ming dynasty fell. He denied that principle exists apart from material force, reading the world as qi in continuous transformation. Nearly unknown in his lifetime, he was recovered in the nineteenth century and treated as an indigenous precursor to modern Chinese philosophy.

Can the two schools be combined?

In practice they usually are. Zhu Xi's edition already blends a divinatory procedure with a philosophical reading, and Song symbol-number thinkers like Shao Yong were pursuing metaphysics rather than fortune-telling. The polemic is sharpest in the third century and softens considerably afterwards, with most later scholars borrowing from both.

Chinese schools

Yili, the meaning-principle reading

A twenty-three-year-old declared that the symbols were a net for catching meaning and should be thrown away once the fish was landed. That argument ended Han numerology's dominance, turned the Book of Changes into a work of philosophy, and made it the text every Chinese official had to know.

12: currents
12: thinkers
1,500: years of commentary

The currents

Meaning-principle is a method rather than a doctrine, and the people using it disagreed profoundly. These are the readings that method produced, from third-century metaphysics to the last great Confucian systems.

🌑

Xuanxue (Dark Learning)

Wei-Jin China 3rd century

Wang Bi's context: a movement reading the Changes, the Laozi and the Zhuangzi together as a metaphysics of non-being. It treated the Changes as an account of how the many arise from the one, and had no use for calendar correlations.

🎣

Grasp the meaning, forget the symbols

China 3rd century

The founding argument, borrowed from the Zhuangzi's fish-trap. Words exist to hold images, images exist to hold meanings, and each should be discarded once it has delivered what it carries. Clinging to the symbol is the mark of someone who has missed the point.

📕

The Zhouyi zhu

China 3rd century

Wang Bi's commentary, completed by Han Kangbo after his death. It explains each hexagram from the relationships among its lines and the situation they describe, without stems, branches or phases, and it displaced the Han commentaries almost entirely.

🏛️

The Tang orthodoxy

Chang'an 7th century

Kong Yingda's Zhouyi zhengyi took Wang Bi's text as the base for the official subcommentary, which fixed the meaning-principle reading as state doctrine for the examination system and guaranteed its transmission.

🌅

The Song reopening

Song China 11th century

Hu Yuan and Li Gou began reading the Changes for social and political argument rather than metaphysics, treating the hexagrams as situations a governor might actually face. It is the turn that makes Cheng Yi possible.

☯️

The Supreme Polarity

Song China 11th century

Zhou Dunyi's short Taijitu shuo derives the cosmos from the Supreme Polarity through yin and yang and the Five Phases, grounding Neo-Confucian metaphysics in a phrase from the Great Treatise and giving the school its cosmological floor.

⚖️

The ethical reading

Luoyang 11th to 12th century

Cheng Yi's Yi zhuan treats each hexagram as a moral and political situation with a right response, and the lines as positions a person may occupy well or badly. Divination is almost absent; the text has become a manual of conduct.

🧭

Zhu Xi's restoration

Fujian 12th century

Zhu Xi argued that the Changes was originally a divination manual and should be read as one, then interpreted philosophically. His Zhouyi benyi restored the yarrow procedure to a text that Cheng Yi had made purely ethical, and became the standard edition.

📖

The historical reading

Song China 12th century

Yang Wanli and others illustrated every hexagram with episodes from Chinese history, so that the figures become a typology of political situations with worked examples. An approach that made the text teachable and enormously popular.

🪷

The learning of the mind

Song and Ming China 12th to 16th century

The Lu Jiuyuan and Wang Yangming current, which located principle in the mind rather than in external things and read the Changes as a description of moral consciousness rather than of a cosmos to be studied.

🎓

Examination orthodoxy

China, Korea, Vietnam 1313 to 1905

Once the Cheng-Zhu reading was made the basis of the civil service examinations, every literate official across the Sinographic world studied the Changes through it. Six centuries of shared curriculum, and the reason the school's vocabulary is the ordinary one.

🌬️

The turn to qi

China 17th century

Wang Fuzhi and others rejected the idea that principle exists prior to material force, reading the Changes as an account of continuous transformation in a world made of qi alone. The last great original system before the Qing turned philological.

The people who built them

The commentator who broke with the Han, the Tang editors who made his reading official, the Song philosophers who rebuilt it as ethics, and the late thinkers who pushed back.

Wang Bi

226–249 Wei China

Wrote the commentary that redirected two thousand years of interpretation, arguing that the images serve meaning and can be discarded once it is grasped. He held minor office, was reportedly poor at his job, and died of an illness at twenty-three.

Han Kangbo

c. 332–380 Eastern Jin

Completed Wang Bi's project by commenting on the Ten Wings, which Wang Bi had left untouched. The two commentaries circulated together thereafter and were transmitted as a single work.

Kong Yingda

574–648 Tang China

Directed the imperial commission that produced the Correct Meaning of the Five Classics, choosing Wang Bi's Changes as its base text. That editorial decision made meaning-principle the orthodox reading for the next thousand years.

Hu Yuan

993–1059 Song China

An influential teacher who read the Changes for practical statecraft and trained a generation of Song scholars. His lectures are among the earliest signs of the shift from metaphysics toward ethics and government.

Zhou Dunyi

1017–1073 Hunan

His two-hundred-character Explanation of the Diagram of the Supreme Polarity became the founding text of Neo-Confucian cosmology. He taught the Cheng brothers and is conventionally counted the first of the Song masters.

Cheng Yi

1033–1107 Luoyang

Wrote the most influential ethical commentary on the Changes, reading every line as a question of right conduct in a given position. Uncompromising in politics and repeatedly banished, he finished the commentary in exile.

Su Shi

1037–1101 Sichuan

Poet, painter and statesman, whose Dongpo Yi zhuan reads the Changes with a literary ear and a scepticism about system-building. It is the most readable of the Song commentaries and the least doctrinaire.

Zhu Xi

1130–1200 Fujian

Synthesised Neo-Confucianism and insisted, against Cheng Yi, that the Changes had begun as a divination manual. His Zhouyi benyi restored the yarrow method, and his edition of the classics shaped education across East Asia for six hundred years.

Yang Wanli

1127–1206 Jiangxi

A major poet who wrote a commentary illustrating each hexagram with historical episodes. The approach made the abstractions concrete and gave later readers a bridge from the figures to actual political judgement.

Wang Yangming

1472–1529 Ming China

Located principle in the mind rather than in the investigation of external things, a position he reached in exile in Guizhou. His reading turns the Changes inward, toward the recognition of moral knowledge already present.

Wang Fuzhi

1619–1692 Hunan

Wrote several works on the Changes in decades of hiding after the Ming collapse, arguing that principle has no existence apart from material force. Almost unknown in his lifetime, he was rediscovered in the nineteenth century and read as a proto-modern thinker.

Li Guangdi

1642–1718 Qing China

Compiled the Zhouyi zhezhong at the Kangxi emperor's direction, an edition that weighs the Cheng and Zhu readings against each other and became the official Qing text of the Changes.

The argument that started it

In the middle of the third century a very young man named Wang Bi wrote a commentary on the Book of Changes containing a passage that would be quoted for the next seventeen hundred years. Words, he said, exist in order to hold images; images exist in order to hold meanings. A trap exists for the sake of the hare, and once you have the hare you forget the trap. Anyone still clutching the image has not understood what the image was for.

The target was the Han symbol-number school, which by then had built an apparatus of calendars, stems, branches, phases and derivation rules so intricate that a commentator could justify almost anything. Wang Bi did not argue that the apparatus was wrong in detail. He argued that it was beside the point, and that a reader accumulating correspondences was doing something other than reading.

Yili, meaning-principle, is the tradition that took his side.

What replaced the machinery

Having discarded the correlations, Wang Bi needed something to read the hexagrams with, and what he used was the internal structure of the figure itself. Which line rules the hexagram. Whether a line sits in a place appropriate to it. Whether it is central, whether it corresponds with the line three places away, whether it is riding on a stronger line or supported by one. What the two trigrams do to each other.

These are not his inventions; they are in the Ten Wings. His contribution was to treat them as sufficient. A hexagram describes a situation, the lines describe positions within it, and interpretation means working out what kind of situation this is and what a person in each position ought to do. Nothing external to the figure is required.

That is a smaller toolkit than the Han school's and a considerably more demanding one, because it offers no way to generate an answer mechanically. It rewards judgement, which is why it produced philosophy rather than technique.

From metaphysics to ethics

Wang Bi read the Changes as metaphysics, in the company of the Laozi and the Zhuangzi, and his Changes is an account of how multiplicity arises from an undifferentiated source. The Tang made that reading official when Kong Yingda selected it as the base for the imperial subcommentary, which settled the question of transmission: Wang Bi's text was copied, and the Han commentaries were not.

The Song changed the subject. Beginning with teachers like Hu Yuan, scholars started reading the hexagrams as political and social situations rather than metaphysical ones, and Cheng Yi completed the shift. His commentary asks, of every line, what a person of integrity in that position should do, and answers in the vocabulary of Confucian ethics. Divination has effectively disappeared. The Changes has become a book about conduct.

Zhu Xi thought this had gone too far. He agreed with the philosophy but insisted on a historical point: the Changes was composed as a divination manual, its language is the language of oracles, and reading it as though it had always been ethics distorts what it says. His Zhouyi benyi puts the yarrow procedure back and then interprets the results morally. The combination is why the tradition is usually called Cheng-Zhu rather than named for either man alone.

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The examination system

In 1313 the Yuan court made the Cheng-Zhu commentaries the basis of the civil service examinations, and later dynasties kept them there until the examinations were abolished in 1905. For nearly six centuries, every literate official in China, and in the Korean and Vietnamese states that adopted the same curriculum, learned the Book of Changes through this school.

The consequence is easy to underestimate. When a Joseon scholar or a Lê-dynasty examinee wrote about the Changes, the concepts and the vocabulary were Cheng Yi's and Zhu Xi's. The meaning-principle reading is not simply one interpretation among several; it is the one that shaped how the entire Sinographic world talked about the text, and it is the substrate under most later East Asian commentary.

Dissent from within

The school was never uniform. Su Shi wrote a commentary with a poet's ear and an allergy to systems. Yang Wanli illustrated each hexagram with historical cases, which made the text teachable and shifted it toward practical judgement. Lu Jiuyuan and later Wang Yangming argued that principle is in the mind rather than in the external investigation of things, which turns the Changes into a description of moral consciousness.

The sharpest break came at the end. Wang Fuzhi, writing in hiding after the Ming collapse, rejected the premise that principle exists prior to or apart from material force. For him there is only qi in continuous transformation, and the Changes describes that process rather than an eternal pattern behind it. He was almost unread in his own time and became important in the nineteenth century, when Chinese thinkers looking for indigenous resources for a modern philosophy found him waiting.

What the school is for

Read as meaning-principle, the Book of Changes is not a device for finding out what will happen. It is a structured account of the kinds of situation a person can be in, and of what integrity requires in each of them. The sixty-four figures are a typology of circumstance: advance, retreat, obstruction, abundance, decline, the moment before completion.

That is why the school outlasted its rivals in the literate mainstream, and why most Western translations reflect it. When Wilhelm renders a line with a note about the conduct of the superior person, he is transmitting Cheng Yi. The alternative reading, the one that computes, never left China in the same way.

Frequently asked questions

: Yi means meaning or rightness and li means principle or pattern, so the compound names a reading concerned with what the text means and the principles it expresses. It is the standing contrast to Xiangshu, symbol-number, which reads the hexagrams as a formal system correlated with calendars and phases.
: A third-century commentator who wrote on both the Laozi and the Book of Changes and set the terms for all later meaning-principle interpretation. His argument that images are a means to meaning and should be discarded once meaning is grasped ended the dominance of Han numerology. He died at twenty-three.
: Cheng Yi read the Changes as pure ethics and had little interest in its use as an oracle. Zhu Xi agreed with his philosophy but insisted the book had originated as a divination manual and that ignoring this misreads its language. Zhu Xi restored the yarrow procedure while keeping the moral interpretation, and the combined Cheng-Zhu position became orthodoxy.
: Only what is inside the figure: which line rules it, whether each line is correct for its place, whether it is central, whether it corresponds with the line three places away, whether it rides on or is supported by its neighbours, and what the two trigrams do to one another. All of these come from the Ten Wings rather than from external correlation.
: Two decisions. Kong Yingda chose Wang Bi's commentary as the base for the Tang official subcommentary, which determined what got copied. Then in 1313 the Cheng-Zhu reading became the basis of the civil service examinations, and stayed there until 1905, so every educated official in China, Korea and Vietnam learned the text through it.
: Cheng Yi effectively was; Zhu Xi was not. The school's core claim is about interpretation rather than about whether one may consult the text. Zhu Xi's position, that you cast the hexagram properly and then read the result for its principle rather than by computing branches and phases, is the mainstream one.
: Largely yes. Legge worked from the orthodox Qing edition and Wilhelm studied with a scholar in that tradition, so the moral and philosophical framing familiar to English readers, including the recurring figure of the superior person, is Cheng-Zhu interpretation. The symbol-number methods used by working Chinese diviners were never transmitted westward in the same way.
: Zhou Dunyi's very short essay explaining a diagram of the Supreme Polarity, deriving yin and yang, the Five Phases and the ten thousand things from an undifferentiated source. It is barely two hundred characters long and became the cosmological foundation of Neo-Confucianism, drawing its key term from the Great Treatise of the Changes.
: A seventeenth-century thinker who wrote extensively on the Changes while in hiding after the Ming dynasty fell. He denied that principle exists apart from material force, reading the world as qi in continuous transformation. Nearly unknown in his lifetime, he was recovered in the nineteenth century and treated as an indigenous precursor to modern Chinese philosophy.
: In practice they usually are. Zhu Xi's edition already blends a divinatory procedure with a philosophical reading, and Song symbol-number thinkers like Shao Yong were pursuing metaphysics rather than fortune-telling. The polemic is sharpest in the third century and softens considerably afterwards, with most later scholars borrowing from both.

All I Ching schools

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