The Wuxing dayi 五行大義 "The Great Meaning of the Five Agents" is a philosophical treatise written by the Sui period 隋 (581-618) master Xiao Ji 蕭吉, courtesy name Xiao Wenxiu 蕭文休. He came from Nanlanling 南蘭陵 (modern Wujin 武進, Jiangsu) and has also compiled the Diwang yangsheng yaofang 帝王養生要方, a book about medicine.|
In the bibliographic treatises in the official dynastic histories Jiutangshu 舊唐書, Xintangshu 新唐書 and Songshi 宋史 it is listed among the treatises on the Five Agents (wuxing 五行), with a length of 5 juan "scrolls". It is divided into 24 chapters and 40 sub-chapters. The first juan is concerned with definitions and methodical discussions, while the rest of the book disputes the theory of the Five Agents and their influence on all aspects of the universe, from the human character and virtues to the musical pitchpipes, the eight winds, the organs in the human body, astronomy, geography, medicine, zoology, and many more aspects of life and religion.
The author is of the opinion that the Five Agents are the ground of all creations and also of human relationships. The five measures (wudu 五度) of Heaven are to be seen in the movements of the celestial bodies, the "five elements" (wucai 五材) of the Earth in the richness of is sources, and the five virtues (wude 五德) of man in the expressions of virtues. In order to clarify their meaning for human life, it is important to undertake prognostications with the help of numerology and other divination methods. The text was finished in 617 and is preserved in a Japanese print from 1699. It makes uses of a lot of ancient sources on the Five Agents.
Gao Liushui 高流水 (1996). "Wuxing dayi 五行大義", in: Feng Kezheng 馮克正, Fu Qingsheng 傅慶升 (ed.), Zhuzi baijia da cidian 諸子百家大辭典, Chengdu: Sichuan renmin chubanshe, p. 433.
Yu Ying'ao 余瀛鰲, Fu Jinghua 傅景華 (ed. 1992). Zhongyi guji zhenben tiyao 中醫古籍珍本提要, Beijing: Zhongyi guji chubanshe, p. 26.