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Zei Xie (Thieving Pathogens) refers to the Qi of the Taiyi Chong Fang (opposite direction of Taiyi), arising because the Qi of Taiyi cannot prosper on its own. From the perspective of Taiyi, it is called Xu Feng (Deficient Wind); from the perspective of Chong Fang, it is called Zei Feng (Thieving Wind); from the perspective of human reception, it is called Xu Xie (Deficient Pathogen), also known as Zei Xie. The Classics state, "Pathogenic factors are those that injure humans through Deficient Pathogens," which is precisely this concept. *Bing Yuan* states: "On the day of Winter Solstice, wind coming from the south is called Thieving Wind." By extrapolation, then, the West Wind at Spring Equinox, the North Wind at Summer Solstice, the East Wind at Autumn Equinox, the Northwest Wind in late Spring, the Northeast Wind in late Summer, the Southeast Wind in late Autumn, and the Southwest Wind in late Winter are all Thieving Winds. The method does not utilize the generation and restriction of the Five Elements, but rather employs the principle of opposition among the Eight Directions. One and Nine correspond oppositely; thus, Zi and Wu oppose each other, allowing Cold and Heat to mutually overcome each other. This principle applies to diseases where extreme Heat reverses into Cold or extreme Cold reverses into Heat. Three and Seven correspond oppositely; thus, Mao and You oppose each other, allowing Warmth and Coolness to mutually overcome each other. Two and Eight, Four and Six correspond oppositely. Two represents Kun Earth, associated with Heat; Eight represents Gen Earth, associated with Cold; Four represents Xun Earth, associated with Warmth; Six represents Qian Earth, associated with Coolness. When Kun and Xun receive Warm and Hot Qi, they both become Damp Earth; when Gen and Qian receive Cold and Cool Qi, they both become Dry Earth. Damp Earth gradually prospers in Chen month and peaks in Wei month; Dry Earth gradually prospers in Xu month and peaks in Chou month. Therefore, Chen-Xu and Chou-Wei oppose each other, allowing Dryness and Dampness to mutually overcome each other. This interpretation aligns with the text of the *Ling Shu* chapter "Nine Palaces and Eight Winds," the section in *Su Wen* regarding disasters under the Wei Ji (Deprived Harmony) phase occurring in the third and fifth palaces, and the section regarding disasters in the seventh palace during Yi Chou and Yi Wei years. The origin lies in the Nine Categories (Jiu Chou) and the Eight Trigrams (Ba Gua).

Zheng Kangcheng of the Han Dynasty, in his commentary on *Shangshu: Hong Fan*, stated: "Wind is the Qi of Central Earth." This statement is most accurate. Earth Qi prospers throughout the four seasons; therefore, the Qi of Spring Warmth, Summer Heat, Late Summer Dampness, Autumn Dryness, and Winter Cold are all manifested in Wind. From the perspective of the Five Elements, it is called Five Qi; from the perspective of the Six Yuan (Six Qi phases), it is called Six Qi; from the perspective of the Four Seasons, it is called Four Qi; from the perspective of the Five Directions, it is called Five Winds; from the perspective of the Eight Directions, it is called Eight Winds; from the perspective of their excessive dominance, it is called Five Evils; from the perspective of the excessive dominance of the Six Qi, it is called Six Exuberances (Liu Yin). All these refer to the same Wind, which is the force by which Heaven and Earth generate, nourish, flourish, harvest, and store all things. When this Qi loses harmony, it causes disease in all things and permeates the four seasons; hence, the Classics state: "Wind is the leader of a hundred diseases." Because its nature is dissipating, the Classics also associate Wind with Wood Qi and attribute it to Spring, just as Dampness is associated with Earth Qi, yet the Classics sometimes attribute it to Autumn. There are several types of Dampness. The ancients strictly defined the vapor of water and earth as true Dampness, while subordinating the Dampness of the Five Elements to Wind. Dampness from food and drink was directly termed Water or Fluid Retention (Yin), with very strict distinctions. Modern people generally label everything as Dampness. However, formulas used by the ancients to treat Dampness cannot be applied to what modern people call Dampness.