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The Three Yin and Three Yang correspond to the Six Qi of Heaven. The Five Zang and Six Fu organs are the有形 (tangible) basis of the Five Elements. The Stomach belongs to Earth, while the Yangming channel governs the Dryness of Autumn. Yangming is the vigorous Qi of the Stomach, which branches off to the Yangming channel; this is analogous to the Bladder being the mansion of fluids, while the Qi of the Taiyang channel is called Ju Yang (Great Yang). This illustrates the distinction between the Five Elements and the Six Qi. Because two Yangs combine to illuminate, it is called Yangming, representing the Qi of extreme Yang abundance. Therefore, the Qi of Stomach Earth should be gentle and soft (Earth governs gentleness), whereas the Qi of Yangming tends toward dryness and heat. Thus, when Yangming receives the damp transformation from its interior counterpart Shaoyin, Yin and Yang achieve harmony. When Stomach Earth combines with Wu and Gui (transforming into Fire), the Qi of Fire and Earth becomes prosperous. Consequently, the Qi of Yangming should be harmonious and gentle, and the Qi of Stomach Earth should be strong and robust. If the Qi of Fire and Earth is weak and additionally influenced by the Dampness of Taiyin, water and grain will fail to digest, leading to deficiency-type diarrhea. In such cases, it is appropriate to use herbs such as Renshen (Ginseng Radix et Rhizoma), Jupi (Citri Reticulatae Pericarpium), Gancao (Glycyrrhizae Radix et Rhizoma), and Banxia (Pinelliae Rhizoma) to assist the Stomach, and Baizhu (Atractylodis Macrocephalae Rhizoma), Cangzhu (Atractylodis Rhizoma), Houpo (Magnoliae Officinalis Cortex), Fuling (Poria), Shengjiang (Zingiberis Rhizoma Recens), and Dazao (Jujubae Fructus) to benefit the Spleen. For severe cases, Fuzi (Aconiti Lateralis Radix Praeparata) may be added to assist the Fire within Gui. Conversely, if the vigorous and hot Qi of Yangming is excessive and cannot be transformed by Taiyin, Yang and Yin become severed, resulting in increased appetite but emaciation. In such instances, it is appropriate to use herbs such as Huanglian (Coptidis Rhizoma) and Zhishi (Aurantii Fructus Immaturus) to suppress Stomach Heat, and Baizhu, Shengjiang, and Dazao to support the Spleen. Li Dongyuan and others regarded Zhizhu Wan (Bitter Orange and Atractylodes Macrocephala Pill) as a method of half-tonifying and half-resolving, failing to grasp the principles of the Five Elements and Six Qi, and missing the intent of the ancient sages in formulating prescriptions.

I have been studying by the window at Nanxuan for over ten years. From morning till night, I have never left this spot. Although the steps before the window are small, they are kept very clean. Every summer after heavy rainstorms, creatures like thumb-sized slugs (Yanyou) and snails resembling field snails grow easily. These arise from sensing the Wind-Dampness of Heaven and Earth, known as "damp-born" among the four types of generation. Humans are born inheriting the Five Elements and Six Qi of Heaven and Earth, and our bodies also possess these Six Qi. For instance, when a Shanghan (Cold Damage) disease affects the Jueyin channel, and one contracts the Wind Qi of Jueyin, roundworms (Hui Chong) may develop in the central Earth (Spleen/Stomach). This is likely due to Wind-Dampness generating them, allowing them to grow large quickly, similar to how slugs and snails grow easily. I have often heard that human internal organs resemble those of pigs. Once, while pausing briefly at a pig-slaughtering site, I happened to observe a pig's small intestine containing a roundworm about one chi long, coiling inside, indistinguishable from human roundworms. It must be understood that when humans suffer from Hui Jue (roundworm colic) with pain, or frequently vomit or pass roundworms, it is mostly due to Damp-Heat in the Spleen and Stomach. Healthy individuals typically do not harbor roundworms. The common folk erroneously persist in the belief that having roundworms in the stomach aids digestion. This is false!