How these texts are read here

Chinese thought has a long tradition concerned less with “what to know” than with “how to get there”: self-cultivation, sustained effort, being tempered in everyday affairs. Song and Ming Confucians called this practice gongfu (工夫). This chapter takes three classical passages and reads them beside the models of the earlier chapters. Reading them side by side means letting each shed light on the other, not letting either prove the other: the ancients knew nothing of Coulomb friction or Kramers’ formula, and no physical equation can prove an old saying right. After each analogy the chapter states its limits.

Heaven moves vigorously

The Commentary on the Images explains the images of the hexagrams and belongs to the “Ten Wings”; tradition ascribed it to Confucius, while most modern scholars date it to the Warring States period. The line takes the unceasing, ever-returning motion of the heavens as an image of the steady effort expected of the noble person.

Read beside Chapter 1, the most apt word in the line is not “vigorous” but “without ceasing”: persistence. The damped restoring model of Chapter 1 showed that a short hard push dies away while a small steady force moves the resting point. “Strengthening oneself without ceasing” describes the second.

Polished in affairs

“Settled in activity, settled in stillness” comes from Cheng Hao’s Letter on Settling Nature: “What is called settledness is to be settled in activity and settled in stillness, without escorting or welcoming, without inner or outer” (程颢 北宋). A passage recorded by Chen Jiuchuan in Book 3 of the Chuanxi lu says the same: “A person must be polished in affairs and do the work there; only that is of benefit.”

The passage can be read beside two chapters. Beside Chapter 2: practising only in quiet is like a wheel spinning with no load; being “polished” in real affairs gives something to push against and a test of whether the practice really turns into action. Beside Chapter 4: “settled in stillness and settled in activity” describes a state that is stable under both conditions. In the bistable model, once the system has crossed the ridge, the new state holds even when outside conditions slip back; Wang’s “standing firm” can be read as a stable state insensitive to changes in conditions.

The great death and coming back to life

In Chan (Zen) usage, the “great death” means the complete cutting off of deluded discrimination, and “coming back to life” means returning to function in ordinary life afterwards. Song-dynasty Chan circles often said “one must die the great death once; only then can one come back to life”; a sermon of Chan master Zhen of Yongguang Monastery in Suzhou has “Let go your hold on the cliff, take it on yourself; after cutting off, revive again — you cannot be deceived” (texts differ between “revive again” and “only then revive”). The phrase in the original idea for this book, “die the great death once, cut off and revive”, is a later popular blend of these two sayings, not a sentence from any one classical text.

Read beside Chapter 3, “letting go of the cliff” resembles crossing a barrier: to reach the other valley one must leave the bottom of the old one and pass an unstable ridge where there is nothing to hold. Kramers’ model shows that this cannot be done by small jiggles near the bottom of the valley; it takes one large enough excursion. Touzi’s answer, “travelling by night is not allowed; you must arrive by daybreak”, can also be read this way: there is no shortcut to sneak through, but the destination is certain.

What the three passages share

Put together, the three passages show a structure that matches this book’s models: persistence (without ceasing), practice under load (polished in affairs) and passing through a transition (the great death and coming back). They correspond to the steady force of Chapter 1, the grip of Chapter 2, and the barrier crossing and hysteresis of Chapters 3 and 4.

Summary

All three passages are about practice, not theory, and their likeness to the physical models is structural: persistence beats bursts, real affairs give something to push against, and leaving an old state means passing a transition with nothing to hold on to. Checking produced two corrections: “heaven moves vigorously” is not the law of inertia, and “die the great death once, cut off and revive” is a later popular blend. The ancients’ words need no proof from physics, and physics cannot replace the cultivation they speak of; read together, the meaning of each becomes clearer.