天有六气，地有五行。六气者，风、火、暑、湿、燥、寒。五行者，木、火、土、金、水。在天成象
，在地成形，六气乃五行之魂，五行即六气之魄。人为天地之中气，秉天气而生六腑，秉
地气而生五脏，六气五行，皆备于人身。内伤者，病于人气之偏。外感者，因天地之气偏，而人气感之。
内外感伤，总此六气。其在天者，初之气，厥阴风木也，在人则肝之经应之。二之气，少阴君火也，在人
则心之经应之。三之气，少阳相火也，在人则三焦之经应之。四之气，太阴湿土也，在人则脾之经应
之。五之气，阳明燥金也，在人则大肠之经应之。六之气，太阳寒水也，在人则膀胱之经应之。天人同气
也。经有十二，六气统焉。足厥阴以风木主令，手厥阴火也，从母化气而为风。手少阳以相火主令，足少
阳木也，从子化气而为暑。手少阴以君火主令，足少阴水也，从妻化气而为热。足太阳以寒水主
令，手太阳火也，从夫化气而为寒。足太阴以湿土主令，手太阴金也，从母化气而为湿。手阳明以燥金主
令，足阳明土也，
从子化气而为燥。盖癸水上升，而化丁火，故手少阴以君火司气，而足少阴癸水在从化之例。丙火下降，而
化壬水，故太阳以寒水当权。而手太阳丙火，在奉令之条，木之化火也。木气方盛，而火气初萌，母强子弱，
故手厥阴以丁火而化气于风木，火气既旺，而木气已虚，子壮母衰、故足少阳以甲木而化气于相火。土之化
金也，土气方盛，而金气初萌，母强子弱，故手太阴以辛金而化气于湿土。金气方旺，而土气已虚，子壮母
衰，故足阳明以戊土而化气于燥金。母气用事，子弱未能司权，则子从母化。子气用事，母虚不能当令。则
母从子化。所谓将来者进，成功者退，自然之理也。
The Heaven has Six Qi (Six Climatic Factors), and the Earth has Five Elements (Wood, Fire, Earth, Metal, Water). The Six Qi are Wind, Fire, Summer-heat, Dampness, Dryness, and Cold. The Five Elements are Wood, Fire, Earth, Metal, and Water. In Heaven, they manifest as phenomena; on Earth, they take form. The Six Qi are the soul of the Five Elements, and the Five Elements are the physical body of the Six Qi. Humans exist in the midst of Heaven and Earth, receiving the Qi of Heaven to generate the Six Fu-organs (Hollow Organs) and receiving the Qi of Earth to generate the Five Zang-organs (Solid Organs). Thus, both the Six Qi and the Five Elements are complete within the human body. Internal injuries arise from deviations in the human Qi. External infections occur because the Qi of Heaven and Earth is deviant, and the human Qi responds to it. Both internal and external injuries are fundamentally caused by these Six Qi.
Regarding the Six Qi in Heaven: The First Qi is Jueyin Wind-Wood, which corresponds to the Liver Meridian in humans. The Second Qi is Shaoyin Ministerial Fire, corresponding to the Heart Meridian. The Third Qi is Shaoyang Ministerial Fire, corresponding to the Sanjiao Meridian. The Fourth Qi is Taiyin Damp-Earth, corresponding to the Spleen Meridian. The Fifth Qi is Yangming Dryness-Metal, corresponding to the Large Intestine Meridian. The Sixth Qi is Taiyang Cold-Water, corresponding to the Bladder Meridian. This reflects the principle that Heaven and Humanity share the same Qi. There are twelve meridians, unified under the Six Qi.
The Foot-Jueyin (Liver) governs with Wind-Wood. The Hand-Jueyin (Pericardium) belongs to Fire; it transforms its Qi according to its Mother (Wood) to become Wind. The Hand-Shaoyang (Sanjiao) governs with Ministerial Fire. The Foot-Shaoyang (Gallbladder) belongs to Wood; it transforms its Qi according to its Child (Fire) to become Summer-heat. The Hand-Shaoyin (Heart) governs with Sovereign Fire. The Foot-Shaoyin (Kidney) belongs to Water; it transforms its Qi according to its "Wife" (referring to the specific Yin-Yang pairing/relationship context in this text) to become Heat. The Foot-Taiyang (Bladder) governs with Cold-Water. The Hand-Taiyang (Small Intestine) belongs to Fire; it transforms its Qi according to its "Husband" (referring to the controlling relationship context) to become Cold. The Foot-Taiyin (Spleen) governs with Damp-Earth. The Hand-Taiyin (Lung) belongs to Metal; it transforms its Qi according to its Mother (Earth) to become Dampness. The Hand-Yangming (Large Intestine) governs with Dryness-Metal. The Foot-Yangming (Stomach) belongs to Earth; it transforms its Qi according to its Child (Metal) to become Dryness.
Generally, Gui-Water rises and transforms into Ding-Fire; therefore, the Hand-Shaoyin governs with Sovereign Fire, while the Foot-Shaoyin's Gui-Water falls under the category of transformation. Bing-Fire descends and transforms into Ren-Water; therefore, the Foot-Taiyang holds authority with Cold-Water, while the Hand-Taiyang's Bing-Fire falls under the category of executing orders.
When Wood transforms into Fire: When Wood Qi is flourishing and Fire Qi is just beginning to sprout, the Mother is strong and the Child is weak. Thus, the Hand-Jueyin transforms its Ding-Fire Qi within Wind-Wood. When Fire Qi is already vigorous and Wood Qi has become deficient, the Child is strong and the Mother is weak. Thus, the Foot-Shaoyang transforms its Jia-Wood Qi within Ministerial Fire.
When Earth transforms into Metal: When Earth Qi is flourishing and Metal Qi is just beginning to sprout, the Mother is strong and the Child is weak. Thus, the Hand-Taiyin transforms its Xin-Metal Qi within Damp-Earth. When Metal Qi is prosperous and Earth Qi has become deficient, the Child is strong and the Mother is weak. Thus, the Foot-Yangming transforms its Wu-Earth Qi within Dryness-Metal.
When the Mother Qi is in charge and the Child Qi is too weak to exercise authority, the Child transforms according to the Mother. When the Child Qi is in charge and the Mother Qi is too weak to hold the mandate, the Mother transforms according to the Child. This is what is meant by "those who are coming forward advance, those who have succeeded retreat," which is the natural law.