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The *Treatise on the Interaction between Vital Qi and Heaven* states: The Yang Qi of the human body is like the sun in the sky; if it loses its proper position, longevity will be shortened and vitality will not be manifest. (Human possession of Yang Qi is akin to the sky possessing the sun; if the sky loses its proper order, the sun becomes obscure, and if humans lose their proper state, Yang Qi fails to consolidate, leading to premature death.) Therefore, the movement of heaven relies on the brightness of the sun; thus, Yang Qi resides above and serves to defend the exterior. (This clarifies the distribution of Yang Qi's circulation and its primary function of assisting and defending the upright Qi of the body.) The function of Yang Qi, when refined, nourishes the Shen (Spirit); when soft, it nourishes the Jin (Sinews/Tendons). (This further explains the transformative and nourishing role of Yang Qi. However, Yang Qi internally transforms into subtle essence to nourish the Shen and Qi, and externally manifests as softness to consolidate the sinews.) Thus, Yang Qi governs the exterior during the day. (During the day, Yang Qi is on the exterior, circulating through the entire body twenty-five times.) At dawn, the Ren Qi (Vital Qi) begins to generate; at noon, Yang Qi is at its peak; by evening, Yang Qi has weakened, and the Qi Gates (men kou, referring to sweat pores/xuanfu) close. ("Long" means high or abundant. The existence of Qi follows a pattern from scarcity to abundance, accumulating warmth to become intense heat, which eventually cools down—this is the principle of things. Thus, Yang Qi generates at dawn, peaks at noon, and diminishes by evening. "Qi Gate" refers to the Xuanfu (mysterious palace), i.e., sweat pores, which are the outlets for Ying and Wei Qi in the meridians, hence called the Qi Gate.) Therefore, in the evening, one should gather and conserve [Yang Qi], avoid disturbing the sinews and bones, and avoid exposure to fog and dew. Violating these three temporal patterns will cause the physical form to become exhausted and thin. (All these measures are to accord with Yang Qi. When Yang Qi goes out, one goes out; when Yang Qi hides, one hides. In the evening, Yang Qi declines and moves inward to the Yin aspects, so it is appropriate to converge and repel empty evils. Disturbing sinews and bones reverses Yang Essence causing depletion, while exposure to fog and dew invites cold-dampness. Thus, adhering to these three temporal patterns preserves innate truth and ensures longevity.) Yin functions to store Jing (Essence) and respond urgently; Yang functions to defend the exterior and maintain solidity. (Describing the application of Yin and Yang in the human body.) If Yin cannot overcome Yang, the vessels flow rapidly and urgently, and excess leads to mania. ("Bo Ji" refers to a pulse that is extremely deficient yet rapid and tense. "Bing" refers to excess and fullness. "Kuang" refers to manic running. When Yang merges into the four limbs, mania occurs. The four limbs are the root of all Yang. When Yang is excessive, the four limbs become solid; when solid, one climbs high and sings; when heat is excessive in the body, one discards clothes and runs. Such cases are termed "Yin failing to overcome Yang.") If Yang cannot overcome Yin, the Qi of the five zang organs conflicts, and the nine orifices become obstructed. (The nine orifices are internally connected to the zang organs and externally serve as sensory organs. Conflict in the Qi of the five zang organs leads to obstruction of the nine orifices. Therefore, the sages harmonize Yin and Yang, ensuring sinews and vessels are harmonious, marrow is solid, and Qi and Blood flow smoothly. In this state, interior and exterior are harmonized, evil cannot harm, ears and eyes are clear, and True Qi stands firm as usual. (Since evil cannot subdue, True Qi remains independent and normal.) If Yang is excessive but not dense/consolidated, Yin Qi will perish. (If Yang is overly strong but fails to consolidate, Yin fluids will leak, and Jing Essence will be exhausted.) When Yin is peaceful and Yang is consolidated, Spirit and Mind are regulated. (When Yin Qi is balanced and Yang Qi is consolidated, Spirit and Mind are increasingly regulated.) If Yin and Yang separate and决裂 (break apart), Jing Essence will perish. (If Yin is not peaceful and Yang is not consolidated, forced discharge depletes innate truth, Jing Essence fails to transform, and circulation ceases.) Exposure to wind and cold leads to alternating chills and fever. (Exposure of the body and contact with wind pathogenic factors cause wind to invade externally while Yang resists internally; the conflict between wind and Yang generates chills and fever.) Therefore, injury by wind in spring, with pathogenic factors lingering, leads to severe diarrhea (Dong Xie). (Wind Qi connects to the Liver; in spring, Liver Wood is dominant. Wood overcoming Spleen Earth causes severe diarrhea.) Injury by summerheat in summer leads to malaria in autumn. (Summer heat is extreme; autumn Yang recedes. The attack of Yang heat results in malaria. "Nue" implies old age or emaciation.) Injury by dampness in autumn leads to upward reversal and cough. (Autumn dampness prevails; winter Water Qi rises. Water attacking Lung Metal causes cough and reversal.) This may develop into flaccidity syndromes (Wei) and cold extremities syndromes (Jue). (Internal attack by dampness causes cough and reversal; external dispersion into sinews and vessels leads to flaccidity.) Injury by cold in winter leads to warm diseases in spring. (Winter cold is condensing; spring Yang Qi emerges. If cold is not released and Yang is constrained within, the persistence of cold and constrained Yang results in warm diseases.) The Qi of the four seasons alternately injures the five zang organs. (Cold, heat, warmth, and coolness succeed each other; the Qi of the four seasons alternately injures the harmony of the five zang organs.)