An In-depth Interpretation of Mencius' 'The Trees of Ox Mountain' Chapter: The Core of Innate Goodness and Cultivation of Mind and Nature

Chapter 9: "That which rested day and night, the energy of the clear dawn" — The Doctrine of Night Energy (Yeqi)

Section 9.1 "Rested day and night": Repetition and Deepening

The phrase "Rested day and night" (Ri ye zhi suo xi) already appeared in the wood analogy. Its re-emergence here shifts the context from "mountain wood" to "human heart." Just as the mountain wood has "rest between day and night" allowing shoots to grow, the human heart also has "rest between day and night," allowing the conscience to recover.

This "rest between day and night" is intimately related to the rhythm of the Heavenly Way. The I Ching (Xici Zhuan) states:

"One Yin and one Yang constitute the Dao. That which follows it is Goodness (shan); that which completes it is Nature (xing)."

The alternation of Yin and Yang is the fundamental rhythm of the Heavenly Way—day is Yang, night is Yin; motion is Yang, stillness is Yin. Human life also follows this rhythm—activity during the day (Yang), rest during the night (Yin). During the day, man is involved in social interactions and temptations of material desire, making the conscience prone to erosion; at night, man is away from these disturbances, and the conscience can rest and recover.

The I Ching (Fu Hexagram, Judgment):

"Reversal (Fu), perhaps this reveals the heart of Heaven and Earth!"

The Fu Hexagram (☷ above ☳ below) symbolizes the return of Yang energy. One Yang at the bottom, five Yin above—though the Yang energy is slight, it has begun to return from the very bottom. This image perfectly corresponds to Mencius’s discourse on "Yeqi": the human conscience begins to recover from the very bottom during the night (One Yang returning).

The I Ching (Fu Hexagram, Image): "Thunder is within the earth, this is Reversal (Fu). The ancient kings, at the winter solstice, closed their gates, forbade merchants from traveling, and did not inspect the regions." The winter solstice marks the initial return of Yang energy, and the sage-kings closed their gates to allow that faint Yang energy to be fully nurtured without disturbance. This is entirely consistent with Mencius’s doctrine of "Yeqi": During the night (the moment Yang energy begins to return), one must allow the conscience to rest quietly, undisturbed by external things.

Section 9.2 "The Energy of the Clear Dawn" (Pingdan zhi qi): Clarity at Dawn

"The energy of the clear dawn" (Pingdan zhi qi) is one of the most important concepts in this chapter.

"Pingdan" refers to the time just before dawn, when the sky is beginning to lighten. Zhao Qi annotates: "Pingdan means the time of clear dawn." At this time, one has just woken from sleep; the night's nourishment is complete, and the day's distractions have not yet begun—this is the moment when the human heart is clearest and closest to its original state.

Why is the "energy of the clear dawn" particularly significant$31

First, "Pingdan" is the moment of Yin-Yang transition. Night belongs to Yin, day to Yang. Pingdan is the moment Yin turns to Yang—the stillness of Yin has completed the nourishment of the conscience, and the activity of Yang has not yet begun to interfere with it. The psychological state at this moment is the purest.

Second, "Pingdan" is the juncture between sleep and wakefulness. During sleep, one is not in contact with external things, not tempted by sensory pleasures and desires, allowing the conscience to return to its original state. Upon waking, yesterday’s desires have faded, and today’s have not yet arisen; the heart’s state is closest to the appearance of the "Good Heart."

Third, the character "Qi" (energy/breath) in "Energy of the Clear Dawn" deserves attention. Why not say "Heart of the Clear Dawn" (Pingdan zhi xin) but "Energy of the Clear Dawn" (Pingdan zhi qi)$32 "Qi" is a crucial concept in pre-Qin philosophy.

Mencius (Gongsun Chou I) records:

"I am skilled at cultivating my vast, flowing energy (haoran zhi qi)." "May I ask what is the haoran zhi qi$33" "It is difficult to speak of. As an energy, it is supremely great and supremely firm. If nourished straightforwardly and without harm, it fills the space between Heaven and Earth. As an energy, it matches Righteousness and the Dao; without these, it becomes weak. This is what is born from the accumulation of Righteousness, not seized by a sudden act of righteousness. If one acts without complacency in one's heart, one becomes weak."

The haoran zhi qi is "supremely great and supremely firm," requiring "straightforward nourishment without harm." It "matches Righteousness and the Dao" and is "born from the accumulation of Righteousness." This haoran zhi qi is the state of spiritual fullness when goodness is completely realized—the towering tree.

The "Energy of the Clear Dawn" (Pingdan zhi qi) relates to the haoran zhi qi as its seed and foundation—it is the existence of the energy of goodness in its weakest, most initial state—the new sprout. If haoran zhi qi is the fully grown tree, pingdan zhi qi is the newly emerging shoot.

The term "Qi" in pre-Qin thought also has another important meaning—it is the intermediary connecting the mind and the body. The heart (xin) is spiritual, the body is material, and "Qi" lies between them. For human goodness to manifest in the real world, it must pass through "Qi." The clarity of the "Pingdan zhi qi" implies that the body and mind are in a harmonious, unified state at this time, allowing goodness to flow out naturally.

The Guanzi (Neiye chapter) discusses the relationship between qi and the heart in depth:

"When a person is born, Heaven produces his essence (jing), and Earth produces his form (xing). These combine to make a person. Harmony produces life; disharmony does not produce life. To observe the Way of Harmony, its essence cannot be seen, and its manifestation cannot be detected. When uprightness is established in the chest, governance resides in the heart; this leads to longevity. Anger and sorrow cause the qi to be lost; worry and fear cause the essence to be depleted; when essence is depleted, it sinks below—this is called essence depletion. The beginning of rage is when qi sinks low. Thus, illnesses arising from the upper burner are due to this."

This passage reveals the relationship between qi and the heart: when the heart is balanced and upright, the qi is harmonious; when afflicted by anger or sorrow, the qi becomes disordered. The clarity of the "Pingdan zhi qi" is precisely because the heart is balanced and upright at this time, free from anger or worry, thus the qi is harmonious and luminous.

The Guanzi (Neiye) further states:

"All Dao has no root, no stem, no leaves, no flourishing. All things are born from it, all things are completed by it; this is called Dao. ... If reverence sweeps away its dwelling place, essence will naturally arrive. If essence concentrates and ponders, and contemplation manages it, with stern demeanor, awe, and reverence, essence will attain stillness. Grasp this and do not let go; let the eyes and ears not be licentious, let the heart have no other goals; establish the heart in the center, and all things will be properly situated."

"If reverence sweeps away its dwelling place, essence will naturally arrive" (Jing chu qi she, jing jiang zi lai)—If one respectfully cleanses the dwelling place of the mind, the pure essence (jing) will arrive on its own. This parallels Mencius’s view: when the mind is allowed to rest quietly at night (the "rest between day and night"), the "qi" of the conscience will naturally recover (the "energy of the clear dawn").

Section 9.3 "How close their likes and dislikes are to those of others": The Faintness of the Sprouts of Goodness

"The energy of the clear dawn, how close their likes and dislikes are to those of other people, is but slight" (Qi hao wu yu ren xiang jin ye zhe ji xi). At the time of clear dawn, the degree to which a person's orientation toward liking good and disliking evil approaches that of a normal, good person is very slight.

This sentence is one of the most difficult in the entire chapter. Zhao Qi annotates: "The energy of the clear dawn still possesses a sliver of good heart, and the degree to which its liking of good and disliking of evil approaches that of a good person is very slight."

Why is it stated as "slight" (ji xi)—very few$34 Because Mencius here is discussing a person whose conscience has been severely lost. This person has committed evil acts day after day during the day ("cut down day after day"), and although the conscience recovers somewhat at night, the degree of recovery is extremely limited. By the time of clear dawn, the person genuinely feels a sliver of goodwill—the heart for liking good and disliking evil exists faintly—but this sliver of goodness, compared to the heart of a normal, virtuous person, is "but slight."

The phrase "ji xi" is extremely precise. "Ji" means subtle or near; "Xi" means few or rare. Together, "ji xi" expresses a state of extreme faintness that has not yet completely vanished. This is like the last remaining new shoot on the barren Ox Mountain—almost invisible, but still present.

Why emphasize this "slightness"$35 Because Mencius intends to achieve two things:

First, acknowledge reality—indeed, for a person who has long done evil, their conscience is very weak. Mencius is not a utopian idealist who ignores reality; he confronts the seriousness of moral degradation.

Second, maintain the principle—although it is "slight," "slight" does not equal "none." As long as even a hair's breadth of liking good and disliking evil remains, it proves that the root of goodness has not been utterly destroyed, and the proposition that human nature is inherently good still stands. This is like stating that as long as even one shoot remains on the barren mountain, it proves the mountain has the capacity to grow trees—even if everyone in the world says, "this mountain never grows trees."

The Analects (Book 9, 30th chapter) records:

The Master said: "It is like building a mound. If I stop when I am one basket-load short of completion, it is I who stopped. If I level the ground, and though I have only added one basket-load, I advance, it is I who advance."

Confucius uses the analogy of building a mound to discuss learning: If you stop just one basket short of finishing the mound, it is your fault for stopping; if you start from flat ground and add just one basket-load, and you advance, it is your progress. This analogy illustrates: a low starting point (even if only "ji xi" remains) is not the problem; the key is whether one continues. Even if only a "slight" amount of goodness remains, if one starts from that "slightness" and continually expands it, one can eventually restore the entirety of the conscience.