Waijing Weiyan

Waijing Weiyan (Subtle Words from the Outer Classic) is a work of traditional Chinese medical theory compiled by the Qing dynasty physician Chen Shiduo (courtesy name Jingzhi, style names Yuangong, Zhuhuazi, and Liangong, self-styled Master of the Daya Hall; a native of Shanyin in Zhejiang, present-day Shaoxing), written around the Kangxi era and traditionally attributed to "the Heavenly Master Qibo." The book runs to nine juan, each with nine chapters, for eighty-one chapters in total. The "outer classic" in the title stands in contrast to the Huangdi Neijing (Inner Classic of the Yellow Emperor) and is meant to expound on meanings the Inner Classic left unaddressed. Building on the theoretical foundation of the Inner Classic, the book discusses health cultivation, tiangui, menstruation, childbirth, longevity and early death, the beginning and end of the meridians, root and branch and favorable versus adverse conditions, the mutual generation and restraint of the Five Phases, the qi transformation of the zangfu organs, the five movements and six qi, the four seasons and eight winds, cold damage and warm epidemics, and yin-yang, cold and heat. Thirteen chapters, including "Lung Metal," "Liver Wood," "Kidney Water," "Heart Fire," "Spleen Earth," and "Stomach Earth," are devoted to the generation-and-restraint relationships among the zangfu organs, the principles of what suits and what harms them, and the treatment rules for organ disorders, linking Five Phases theory with clinical pattern differentiation; the book also offers many distinctive interpretations of meridian theory and the six qi. On health cultivation, it argues from the angles of calming the mind, guarding the spirit, and preserving essence, stressing conformity with the four seasons and protection of the true fire of the mingmen. The text is terse and archaic, its reasoning dense, making it an important source for studying Chen Shiduo's thought and Qing dynasty medical theory and a valuable reference for understanding how Inner Classic theory was extended into clinical practice.