2Things, Theories - Sorting Themselves. Wu Kuang- ming. The Butterfly as Companion. Meditations on the first three Chapters of the Chuang Tzu. Albany, NY: State University of New York Press, 1990.1
3成玄英.《庄子序》，《庄子集释》.
4郭庆藩辑.《新编诸子集成》本.第一册，第7页。北京，中华书局，1982年版.
5Benjamin I. Schwartz, The World of Thought in Ancient China. 《Cambridge, MA: Harvard University Press,1985》, pp. 215-216.
