夫阴阳升降，在天在泉，上下有位，左右有纪，地理之应，标本不同，气应异象，逆顺
变生，太过不及，悉能病患，世谓之时气者，皆天气运动之所为也。今先次地理本气，然后
以天气加临为标，有胜有复，随气主治，则悉见病源矣。
自大寒后至春分，厥阴风木为一主气)。春分至小满(少阴君火为二主气)，小满至大暑(
少阳相火为三主气)，大暑至秋分，（太阴湿土为四主气)，秋分至小雪(阳明燥金为五主气)。
小雪至大寒(太阳寒水为六主气)。
凡一气所管六十日八十七刻半为本气，后以天之六气临御，观其逆从，以药调和，使上
下合德，无相夺伦，此天地之纪纲，变化之渊源，不可不深明之。
辰戌之岁，太阳司天，太阴在泉，气化营运先天。初之气，乃少阳相火加临厥阴风木，
民病瘟，身热头疼，呕吐，肌腠疮疡。二之气，阳明燥金加临少阴君火，民病气郁中满。三
之气，太阳寒水加临少阳相火，民病寒，反热中，痈疽注下，心热瞀闷。四之气，厥阴风木
加临太阴湿土，风湿交争，民病大热少气，肌肉痿，足痿，注下赤白。五之气，少阴君火
加临阳明燥金，民气乃舒。终之气，太阴湿土加临太阳寒水，民乃惨凄孕死。治法，用甘温
以平水，酸苦以补火，抑其运气，扶其不胜。
The ascending and descending of Yin and Yang Qi, whether in the Heaven (upper) or on the Earth (lower), have their fixed positions, and left and right have their regulations. The response of geography to the celestial phenomena differs in root and branch; the resonance of Qi manifests different images. Changes in compliance or opposition give rise to diseases. Both excess and deficiency can cause illness. What the world calls "Seasonal Qi" (Shi Qi) is all caused by the movement of Heavenly Qi. Now, we first discuss the Local Primary Qi (Ben Qi, the constant seasonal climate pattern), and then superimpose the Heavenly Six Qi (Ke Qi, the variable annual climate factors) as the branch. With winning and retaliating Qi, treating according to the nature of the Qi will reveal the source of all diseases.
From after Great Cold until Spring Equinox, Jueyin Wind-Wood is the First Primary Qi. From Spring Equinox until Grain Full, Shaoyin Ministerial Fire is the Second Primary Qi. From Grain Full until Great Heat, Shaoyang Ministerial Fire is the Third Primary Qi. From Great Heat until Autumn Equinox, Taiyin Damp-Earth is the Fourth Primary Qi. From Autumn Equinox until Light Snow, Yangming Dry-Metal is the Fifth Primary Qi. From Light Snow until Great Cold, Taiyang Cold-Water is the Sixth Primary Qi.
Each Primary Qi governs for 60 days and 87.5 ke, known as the Ben Qi (Primary/Local Qi). Subsequently, the Heavenly Six Qi (Ke Qi) are superimposed to rule. Observing their compliance or opposition, one uses herbs to harmonize, ensuring that upper and lower coordinate without violating order. This is the guideline of Heaven and Earth, the origin of changes, which must be deeply understood.
In years of Chen and Xu, Taiyang Cold-Water rules as the Si Tian (Ruling Qi of Heaven), and Taiyin Damp-Earth resides as the Zai Quan (Ruling Qi of Earth). The Qi transformation operates prior to the natural sequence. In the First Qi phase, Shaoyang Ministerial Fire is superimposed upon Jueyin Wind-Wood. The people suffer from epidemics, fever, headache, vomiting, and sores/ulcers on the skin and muscles. In the Second Qi phase, Yangming Dry-Metal is superimposed upon Shaoyin Ministerial Fire. The people suffer from Qi stagnation and abdominal fullness. In the Third Qi phase, Taiyang Cold-Water is superimposed upon Shaoyang Ministerial Fire. The people suffer from cold, yet internal heat arises; they develop carbuncles, ulcers, and dysentery, with heart heat and mental confusion/oppression. In the Fourth Qi phase, Jueyin Wind-Wood is superimposed upon Taiyin Damp-Earth. Wind and Damp compete. The people suffer from high fever, shortness of breath, muscle atrophy, flaccidity of the legs, and dysentery with red and white discharge. In the Fifth Qi phase, Shaoyin Ministerial Fire is superimposed upon Yangming Dry-Metal. The Qi of the people becomes relaxed and comfortable. In the Final Qi phase, Taiyin Damp-Earth is superimposed upon Taiyang Cold-Water. The people feel desolate and cold, leading to death. The treatment method: use Sweet-Warm herbs to level Water Qi, and Sour-Bitter herbs to tonify Fire Qi. Suppress the dominant Luck Qi, and support the Qi that is unable to overcome it.