Zi Ping Zhen Quan — On Yin–Yang Generation and Control: Original Text, Translation & Interpretation

The course of the four seasons is completed through generation: Wood generates Fire, Fire generates Earth, Earth generates Metal, Metal generates Water, and Water in turn generates Wood. This is the sequence of generation, revolving and alternating in cycles so that the seasons proceed without exhaustion. Yet wherever there is generation, there must also be control. Without control, generation alone would not bring the four seasons to completion. Control checks and restrains, causing what has spread outward to draw inward and gather, thereby creating the conditions for renewed expression. Hence it is said, “Heaven and Earth are regulated, and the four seasons are formed.”

Take Wood as an example: Wood flourishes in summer and is subjected to autumn’s killing force. “Killing” here means that what has flowed outward is gathered and stored within; thus killing is precisely what makes renewed life possible. The text invokes the Book of Changes, taking gathering-in to be the full expression of nature and disposition, and the Dui trigram (兌) to be that in which all things delight. How profound these words are!

This passage first lists the cycle of generation, then places “control” within that same seasonal order: generation lets qi unfold outward, while control restrains that unfolding and turns it toward storage. “Killing” here refers to autumn’s seasonal killing and contraction—the force of gathering—not yet to the Ten-God category of Seven Killings discussed later in the chapter. Keeping these uses distinct clarifies that “killing is precisely what makes life possible” describes the transition from storage to renewed growth.

Xu Lewu’s commentary agrees that “generation and control serve together, and control and generation accomplish the same work,” setting spring and summer’s mild yang alongside the seasonal killing force of autumn and winter. The original passage explains how the seasons complement one another; Xu extends this idea to generation and support, and control and draining, and qualifies it by saying their purpose is to return to balance. This does not mean that generation is always beneficial or control always harmful.

Consider how a person sustains life: food and drink are indeed what nourish it. But if someone ate and drank constantly, never allowing even a little hunger before the next meal, could that person live long? Thus, in the course of the four seasons, generation and control serve together; control and generation accomplish the same work.

This analogy follows the previous passage’s idea of “checking and restraining.” Sustained nourishment and timely restraint must be understood as parts of one process. The passage concerns generation and control in the seasonal cycle; eating and drinking serve only as an analogy for how allowing something to pause makes its continuation possible.

Xu’s commentary grounds “serve together” and “accomplish the same work” in balance. Thus, although both can play a role, this does not mean that generation and control are equally beneficial in every combination. The sentence alone does not specify the conditions for deciding whether a particular Four Pillars chart calls for generation and support, or control and draining.

If we speak of the Five Phases as a whole, Water generates Wood and Metal controls Wood. If we distinguish and pair the yin and yang of each phase, however, differences arise within generation and control themselves. This is why Water, though it generates Wood in either case, gives rise to Indirect and Direct Resource; and Metal, though it controls Wood in either case, gives rise to Officer and Seven Killings.

Within the Resource category, Indirect and Direct Resource are similar; their differences in generation and control may be set aside for now. Within control, however, the distinction between Officer and Seven Killings is plainly drawn as good and bad, and its rationale must be examined carefully.

This passage moves from Five Phase relationships to yin–yang pairings. “Water generates Wood” and “Metal controls Wood” describe the direction of generation or control; Indirect and Direct Resource, and Officer and Seven Killings, further distinguish the yin–yang pairing within those relationships. The text’s statement that Indirect and Direct Resource are “similar” sets aside their differences for the moment; it does not mean they can be used interchangeably in every later context.

Xu explains Resource, Wealth, and Officer/Seven Killings through the relations “generates me,” “I control,” and “controls me,” and classifies control by a Stem of the same yin–yang polarity as Seven Killings, while control by a Stem of the opposite polarity is Direct Officer. “Me” here means the Heavenly Stem being compared. The following passages illustrate these categories through Jia, Yi, Geng, and Xin. The original text’s moral distinction between “good” and “bad” describes its Officer/Seven Killings classification; it is not a judgment about a person’s character, nor does it establish that Seven Killings is harmful in every combination.

Xu also discusses the purity or mixture of these relationships and the strength with which they are used. This is an additional distinction made in the commentary. The passage does not provide a rule for ranking the strength of all Ten Gods independently of their combinations.

Take Jia, Yi, Geng (庚), and Xin (辛) as examples. Jia is yang Wood, the qi of Wood’s life and growth. Yi is yin Wood, the form and substance of Wood. Geng is yang Metal, the qi of autumn’s killing force. Xin is yin Metal, the substance of metal among human beings. The vital qi of Wood is lodged in Wood yet moves through Heaven; therefore, when it encounters autumn, it is classified as “Officer.” Yi, by contrast, is different: for Yi, Geng is Officer and Xin is Seven Killings.

The original text uses the contrast between qi and form/substance, and between autumn’s seasonal killing force and metal among human beings, to explain why Jia and Yi have different Officer/Seven Killings relationships with Geng and Xin, even though Metal controls Wood in both cases. Its explicit conclusion for Yi is that Geng is Officer and Xin is Seven Killings.

There is a tension in the passage’s treatment of Jia. It first identifies Geng with the qi of autumn’s killing force, then says that Wood’s vital qi is classified as “Officer” when it encounters autumn. Under the same-polarity classification in Xu’s preceding commentary, Jia and Geng are both yang and should be classified as Seven Killings; Jia and Xin have opposite polarities and should be classified as Direct Officer. These statements do not fit together without conflict. The translation preserves the original’s word “Officer” without turning it into a separate rule that Geng is Direct Officer for Jia.

In his later commentary, Xu explicitly objects that treating Yi as the form/substance of Wood and Xin as the substance of metal “does not seem entirely appropriate.” He argues that all Ten Stems are qi moving through Heaven and should be distinguished by their qi, polarity, and qualities. The original’s analogy and Xu’s objection should therefore be read side by side.

Take Bing (丙), Ding (丁), Geng (庚), and Xin (辛) as another example. Bing is yang Fire, the qi of harmonious warmth. Ding is yin Fire, wood-fueled fire. The qi of autumn’s killing force is overcome when it encounters harmonious warmth, but metal among human beings is not threatened by harmonious warmth. Thus Bing is Seven Killings for Geng, while Bing is Officer for Xin. Metal implements, by contrast, are immediately melted by wood-fueled fire, while the qi of autumn’s killing force is not threatened by such fire. This is why Ding is Seven Killings for Xin, while Ding is Officer for Geng. From these examples, the remaining controlling relationships may be inferred.

This passage states four relationships: for Geng, Bing is Seven Killings and Ding is Officer; for Xin, Bing is Officer and Ding is Seven Killings. Under the polarity classification in Xu’s preceding commentary, the two Seven Killings pairings have the same polarity, while the Direct Officer pairings have opposite polarities. Fire still controls Metal in each case; what changes is the classification of the controlling Stem as Officer or Seven Killings.

The phrases “not threatened by harmonious warmth” and “not threatened by wood-fueled fire” should be read with the immediately following classification as “Officer.” They should not be translated as saying that Bing has no controlling effect on Xin, or Ding no controlling effect on Geng. The original uses the contrast between harmonious warmth and wood-fueled fire, and between autumn’s seasonal killing force and metal implements, to explain the distinction between the two relationships. It does not specify a measure for comparing their actual strength in particular combinations.

Xu is likewise cautious about the claim that Ding is wood-fueled fire. He warns readers not to cling to the analogy and emphasizes that the suitability or unsuitability of the Five Phases depends on their combinations, with seasonal conditions also varying. This chapter can help identify relationships and understand the authors’ explanations, but judgments of favorability must still take combinations and seasonal context into account. The labels Officer and Seven Killings alone do not establish that one’s effect is always good or bad.