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Yin and Yang possess the laws of creation (Zao), transformation (Hua), ascending (Sheng), descending (Jiang), increasing (Zhang), and decreasing (Xiao). Generation, growth, ascending, and creating belong to Yang; nourishment, decreasing, descending, and transforming belong to Yin. Yin undergoes transformation, which is created by Yang; Yin descends, which is ascended by Yang. When "decreasing" occurs, things perish and do not return; when "increasing" occurs, things grow. Regarding "descending," its nature is sinking; regarding "transforming," its nature is slow; regarding "decreasing," its nature is rapid. "Transforming" also contains the mechanism of endless generation, referred to as Shenghua (generation and transformation), Huasheng (transformation into generation), strengthening the stubborn, Fenghua (wind transformation), Dehua (virtue transformation), etc. All these are achieved gradually. This is the most subtle yet most manifest principle in physical phenomena.

Chenpi (Aged Tangerine Peel) regulates Spleen Qi and transforms Qi stagnation; it does not tonify Spleen Qi. Retaining the white pith makes it Jupi (Tangerine Peel), which can still harmonize the Middle Jiao because the white color corresponds to a sweet and mild nature. Removing the white pith makes it Juhong (Red Tangerine Peel), which specializes in descending Qi and resolving phlegm, becoming an agent of depletion and attack. Descending addresses Qi stagnation; resolving addresses Phlegm congestion. Through descending and resolving, if there is Qi stagnation or Phlegm congestion, the disease is affected (eliminated). However, if Stagnation arises from Spleen Deficiency, and Phlegm is generated from Spleen Deficiency, one should use Renshen (Ginseng) and Baizhu (Atractylodes Macrocephala) to treat the root. One must avoid indiscriminately using agents like Juhong, Banxia (Pinellia Rhizome), and Erchen Tang (Two-Aged Decoction), as this would merely deplete True Qi. Therefore, the sages insisted that the ingredients in Erchen Tang must be aged, precisely because fresh herbs have violent properties that drain True Qi.

As for Banxia, its nature is dry and hot; long-term use can secretly consume the True Qi of the Spleen. It is appropriate only when Heat is generated from Dampness, and Phlegm is generated from Heat, and even then, it should only be used temporarily and in small doses. There is no scenario where robust Spleen and Stomach function leads to pathology caused by Damp-Heat. Why do physicians of today often regard Erchen Tang as a common spleen-tonifying preparation? They fail to distinguish between Spleen Yin and Spleen Yang, presence or absence of Dampness, and deficiency or excess patterns. They claim this is the "Kingly Way." Even in cases of Yin-deficiency with chronic cough, where Metal and Water (Lung and Kidney) are both exhausted, they still recklessly use it. In recent years, a salt merchant named Lian Xiangwu suffered from the aforementioned condition. Two physicians administered agents such as Kuandonghua (Adenophora Flower), Juhong, Maidong (Ophiopogon Tuber), Shihu (Dendrobium Stem), and Baishao (White Peony Root). His wheezing and coughing doubled, accompanied by vomiting and chest fullness. Yet, they offered excuses, saying, "It is necessary to vomit out saliva and phlegm for a rapid recovery." Alas! Prescribing medication based solely on symptoms without understanding the disease origin is ignorance contrary to one's true intent, and feigning uniqueness to cover up errors. Such people rarely escape causing death.