Chapter Four: Huitong (Convergence and Connection) — Pivot Points Amid Change

I. The Deeper Meaning of "Observing Where They Converge and Connect"

"Observing where they converge and connect" (guan qi huitong) — these four characters are exquisitely precise, encapsulating the core of the Zhouyi's philosophy of change.

Hui (会) means to come together, to converge. Tong (通) means to reach through, to connect. Together, huitong refers to the points of convergence and the pathways of connection within the processes of change.

Everything under heaven is in motion, but dong is not chaotic. Within seemingly endless change, there are always certain critical nodes — at these nodes, multiple threads of change converge (hui), forming comprehensible pathways (tong).

An illustrative analogy: a great river flows ceaselessly (dong), but within the river there are always certain notable places — forks, confluences, sharp bends, falls. At these places, the direction and force of the current change markedly; these are the river's huitong points. A skilled hydraulic engineer need not trace the trajectory of every drop of water; he need only grasp these critical huitong points to understand the river's overall behavior and put it to use.

Similarly, the sage's "observing" of the movements of all under heaven does not require knowing the details of every thing's change at every moment (an impossibility), but grasping the critical convergence points — the pivots where multiple forces concentrate and multiple trends connect.

II. Huitong and the Logic of Change in Lines and Hexagrams

Within the hexagram-and-line system, huitong manifests in the relationships among lines.

A hexagram has six lines, from the bottom (initial) to the top, representing the complete process of a thing from inception to conclusion. Within this process, each line occupies a specific position (wei) and stands in specific relationships with the other lines — ying (correspondence: first and fourth, second and fifth, third and sixth), bi (adjacency: neighboring lines), cheng (riding: an upper line upon a lower), cheng (supporting: a lower line beneath an upper). These relationships constitute the huitong within the hexagram.

Take the Qian (Heaven) hexagram as an example. Its six lines:

Initial Nine: A submerged dragon — do not act. Nine in the Second: A dragon appearing in the field — it is beneficial to see a great person. Nine in the Third: The noble one is ceaselessly active all day; vigilant in the evening — perilous, but no fault. Nine in the Fourth: Perhaps leaping over the abyss — no fault. Nine in the Fifth: A flying dragon in the heavens — it is beneficial to see a great person. Top Nine: An overreaching dragon — there will be regret.

From "submerged" to "appearing" to "ceaselessly active" to "perhaps leaping" to "flying" to "overreaching" — this traces a complete process of change: yang energy from latency, to manifestation, to striving, to ascent, to soaring, to excess. Each transition is a point of huitong. The reason the Nine in the Third is "ceaselessly active all day; vigilant in the evening" is precisely because it stands at the critical juncture (hui) between the lower and upper trigrams; with care, it can connect upward (tong); with carelessness, it may fall. This is how huitong manifests in concrete line imagery.

The Master offered an exceedingly apt reading. The Wenyan Zhuan (Commentary on the Words of the Text) records:

"Nine in the Third: doubly firm yet not in the center — above, not yet in heaven; below, no longer in the field. Therefore he is ceaselessly active, watchful according to the time, and though in danger, incurs no fault."

"Doubly firm yet not in the center" — Nine in the Third is a yang line in a yang position (doubly firm) but not in the central position of the second or fifth (not in the center), hence its precarious situation. "Above, not yet in heaven; below, no longer in the field" — it can neither rest securely in the high station of the flying dragon of Nine in the Fifth, nor settle in the central position of Nine in the Second, but instead stands at a transitional, unstable huitong point. Precisely because it stands at such a critical node, it must be especially vigilant. This is the concrete application of "observing where they converge and connect."

III. The Pre-Qin Intellectual Background of the Huitong Concept

The concept of huitong finds wide resonance in pre-Qin thought.

The Lunyu (Weizheng) records the Master's words:

"To review the old and know the new — this qualifies one to be a teacher." (Wen gu er zhi xin, ke yi wei shi yi.)

"Reviewing the old" is grasping accumulated experience; "knowing the new" is connecting to future changes. Bringing past and future into convergence and connection (huitong) — this is the way of the teacher.

The Zhongyong (Doctrine of the Mean), Chapter 1:

"Before the feelings of pleasure, anger, sorrow, and joy are aroused, this is called equilibrium (zhong). When they are aroused and all attain due measure, this is called harmony (he). Equilibrium is the great foundation of all under heaven; harmony is the universal way of all under heaven."

Zhong is the state before arousal; he is the state of arousal in due measure. In the transformation from zhong to he, "due measure" (zhongjie) is itself a huitong — how feelings are transformed from inner to outer, expressed at the right moment in the right way: this is "observing where they converge and connect" as it unfolds in the domain of cultivating the emotions.

The Mengzi (Wanzhang Xia) records Master Meng's characterization of the Master (Confucius) as "the sage of timeliness":

"The Master may be called the one who gathered all into grand completion. To gather all into grand completion is to sound the bronze bell and conclude with the jade chime. Sounding the bronze bell is the beginning of orderly pattern; concluding with the jade chime is the completion of orderly pattern. The beginning of orderly pattern is the work of wisdom; the completion of orderly pattern is the work of sageness."

The connection (huitong) between "beginning of orderly pattern" and "completion of orderly pattern" is "grand completion." The Master was revered as the supreme sage precisely because he could bring together the changes of past and present and the strengths of all schools into an organic whole through huitong.

From this we can see that huitong is not merely a technical term in Yijing studies, but a fundamental characteristic of pre-Qin thinking as such. Pre-Qin thinkers attended not to static "being" but to dynamic "process"; not to isolated "nodes" but to the "connections" among nodes. "Observing where they converge and connect" is grasping the critical connections and turning points amid the torrent of change, thereby comprehending change's laws.