Chapter Eight: The Unity of Xiang and Yao — The Complete Architecture of the Zhouyi

I. Xiang Is the Foundation of Yao; Yao Is the Unfolding of Xiang

In this chapter's passage, xiang is discussed before yao, and this order is deliberate.

Xiang grasps the profundity of all under heaven (deep structure); yao grasps the movements of all under heaven (the process of change). Epistemologically, we must first understand a thing's structure before we can understand its change — for change always occurs within a structure. Without structure, change has nothing to attach to; without change, structure has no vitality.

Chapter 2 of the Xi Ci Shang Zhuan says:

"The sage established the hexagrams and observed the images, appended statements to make clear the auspicious and inauspicious, and the firm and the yielding pushed against each other to generate change."

"Establishing hexagrams and observing images" is the first step — constructing structure. "Appending statements to clarify auspiciousness and inauspiciousness" is the second step — describing change and its trends. "The firm and the yielding pushing against each other to generate change" is the third step — revealing the motive force behind change.

It also says:

"Therefore what the noble one dwells in with ease is the sequence of the Yi; what he delights in and studies are the statements of the lines. Therefore, at rest the noble one observes its images and studies its statements; in action he observes its changes and studies its prognostications."

"At rest, observe the images" — in stillness, contemplate the hexagram images to grasp the overall configuration. "In action, observe the changes" — when acting, attend to the changing lines to grasp the specific direction. This is precisely the division of labor and coordination of xiang and yao in practical use.

II. Xiang as Substance, Yao as Function

In the terminology of Song-dynasty Neo-Confucians, xiang pertains to "substance" (ti) and yao to "function" (yong). But this is not a simple ti-yong dichotomy — in the Zhouyi, substance and function are mutually encompassing.

Every xiang contains within it the possibility of change (substance contains function); every yao presupposes the framework of structure (function contains substance). The xiang of Qian is heaven, yet Qian's six lines from submerged to flying to overreaching display the complete process of heaven's operation — the image has come alive within the lines. Conversely, the auspiciousness or inauspiciousness of each line depends on its position within the hexagram image's overall structure — the line finds its orientation within the image.

Wang Bi, in his Zhouyi Lüeli ("Summary of the Principles of the Zhouyi," section Mingxiang — "Clarifying Images"), wrote:

"Images are what bring forth meaning. Words are what make images clear. Nothing expresses meaning as fully as images; nothing expresses images as fully as words. Words are born from images; thus one may trace the words to observe the images. Images are born from meaning; thus one may trace the images to observe the meaning. Meaning is fully expressed through images; images become manifest through words. Therefore words are the means of making images clear — having grasped the image, forget the words. Images are the means of preserving meaning — having grasped the meaning, forget the images."

Wang Bi's passage is often simplified to the thesis "grasp the meaning and forget the image" (de yi wang xiang). In reality, he precisely describes the progressive relationship among three levels: "meaning → image → words" (i.e., "ze → xiang → statement"). "The profundity of all under heaven" is meaning (the deepest textures); xiang is the imaging of meaning; "statements" (appended words) are the articulation of images. The three are interlinked; none may be neglected.

III. Different Emphases in Successive Eras

The Han-dynasty image-and-number school (Meng Xi, Jiao Yanshou, Jing Fang) emphasized xiang. They developed elaborate systems of hexagram-qi, najia (stem-branch correlation), and hidden-and-manifest lines, vastly expanding the xiang system to map virtually all of heaven, earth, and the myriad things into hexagram correspondences. This school may be seen as the extreme development of the first half of the passage: "the sage has the means to perceive the profundity of all under heaven, and fashions likenesses of their forms and appearances, imaging what is fitting for each thing — therefore these are called xiang."

The Wei-Jin moral-philosophical school (Wang Bi, Han Kangbo) emphasized "meaning" (yi), advocating "grasping meaning and forgetting images" and "sweeping away images to return to moral significance." They held that excessive fixation on image-and-number exegesis obscured moral-philosophical meaning, and urged direct apprehension of the moral-philosophical content of hexagrams and lines. This school, in a sense, stressed the latter half of the passage: "appending statements to determine what is auspicious or inauspicious" — the statements (moral-philosophical meaning) are the ultimate purpose; images are merely instrumental.

The Song-dynasty Neo-Confucians (Cheng Yi, Zhu Xi) sought a balance between image-and-number and moral-philosophical approaches. Cheng Yi's Yichuan Yi Zhuan prioritizes moral-philosophical meaning without discarding images; Zhu Xi's Zhouyi Benyi prioritizes the original purpose (divinatory use) while incorporating moral-philosophical meaning — each has its emphasis, but both attempt a synthesis.

The Qing-dynasty evidential scholars (Hui Dong, Jiao Xun, Zhang Huiyan) returned to the image-and-number path, using rigorous philological methods to reconstruct the Han-dynasty image-and-number system and correct the Song Confucians' tendency toward vague moral-philosophical speculation.

These different approaches to the Yijing are in fact developments of different facets of this chapter of the Xi Ci Zhuan. If we return to the passage itself, we find: the text's design gives equal weight to xiang and yao, to structure and process, to contemplation and decision — any reading that leans to one side at the expense of the other will lose the passage's complete meaning.