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When Qi arrives, reaching its extreme results in disaster; thus, when Qi invades, it must be balanced through counteraction (referring to the controlling cycle of the Five Elements). When things reach their extreme, they reverse; this is the natural law. Generally speaking, the six Qi of Cold, Heat, Dryness, Dampness, Wind, and Fire, and the forms of the Five Phases of Wood, Fire, Earth, Metal, and Water: when excessively hyperactive, they harm all things; when there is succession (constraint), they restrain this extremity. Therefore, reaching the extreme causes disaster, and counteraction restores peace; this is the subtlety of Qi dynamics, clear and evident. This is the meaning of "Hyperactivity brings harm, succession brings restraint." Investigating the mechanism of Yin and Yang in heaven and earth, extreme cold generates heat, and extreme heat generates cold; these changes are unpredictable like spirits, orchestrating and controlling what lies within. Thus, when Wood is at its extreme, it resembles Metal; when Fire is at its extreme, it resembles Water; when Earth is at its extreme, it resembles Wood; when Metal is at its extreme, it resembles Fire; when Water is at its extreme, it resembles Earth. This is because when Qi is hyperactive to the extreme, the element that succeeds/constrains it becomes stronger than itself. Only those who bear its hyperactivity and restrain its harm can accomplish the work of creation. Now, below Xianghuo (Ministerial Fire), Shuiqi (Water Qi) succeeds, so Fire does not undergo abnormal changes; below the position of Water, Tuqi (Earth Qi) succeeds, so Water Qi does not cause disasters; below the position of Earth, Muqi (Wood Qi) succeeds, so Earth Qi flows smoothly; below the position of Wind, Jinqi (Metal Qi) overcomes, so Wind Qi calms down. Rehuo (Hot Fire) succeeds Zaojin (Dry Metal), naturally forming the pathology of the Metal aspect; Yinjing (Yin Essence) succeeds Junhuo (Sovereign Fire), naturally forming the manifestation of the Fire aspect. What is meant by "hyperactivity brings harm, succession brings restraint" is merely this. I have examined the *Suwen: Liuyuan Zhengji Dalun* (Great Treatise on the Correct Records of the Six Sources), which states: Where Shaoyang reaches, it manifests as the generation of Fire, ultimately manifesting as steaming humidity (Fire transformation generates, thus Fire is generated; Yang is above, so it ultimately manifests as steaming humidity); this is the meaning of Shuihua (Water transformation) succeeding Xianghuo (Ministerial Fire). Where Taiyang reaches, it manifests as cold snow, hail, and white dust; this is the meaning of Tuhua (Earth transformation) succeeding Han Shui (Cold Water) (Frost, snow, and hail belong to Water; white dust below succeeds Earth). Furthermore, where Taiyin reaches, it manifests as thunderstorms and fierce winds (Thunderstorms belong to Earth; fierce wind below succeeds the Wood Qi); where Jueyin reaches, it manifests as the generation of Wind, ultimately manifesting as solemnity/stillness (Wind transformation generates, thus Wind is generated; Su means stillness); where Yangming reaches, it manifests as scattering and warmth (Scattering belongs to Metal; warmth if overcome by Fire Qi); where Shaoyin reaches, it manifests as the generation of Heat, with an intermediate manifestation of Cold (Heat transformation generates, thus Heat is generated; Yin Essence succeeds from above, so the intermediate manifests as Heat). Is this not "hyperactivity brings harm, then succession brings restraint"? In ancient times, Huangdi (Yellow Emperor) and Qibo explored the heavenly records to the utmost, the geographical features to the end, took examples from distant objects, and from nearby human bodies, questioning each other to compose the *Neijing* (Inner Canon). Regarding the *Liweizhi Dalun* (Great Treatise on the Micro Principles of the Six), there are statements about the succession of the Six Qi reaching extremes, asserting that restraint allows for generation and transformation, distinguishing excess and deficiency externally; harm leads to disorder, and generation/transformation leads to major diseases. All Qi coming from below that overcomes [the preceding element] serves to break down its superficial excess. Otherwise, how could Water activation bring hail and snow, Earth activation bring sudden gusts, Wood activation break branches, Metal activation bring clarity, and Fire activation bring obscurity? These are all manifestations of depression reaching its extreme before erupting, serving to succeed the hyperactive Qi. Alas! One who understands Heaven, Earth, and Humanity is called a Confucian scholar. Do medical practitioners only treat diseases? One must reflect that without understanding the principles of Heaven and Earth, one is insufficient to be...