 The Zhuangzi began to have a noticeable influence on the later Daoist tradition from the 4th century CE, when it became one of the sources of inspiration for the Shangqing (Highest Clarity) school of Daoism (see  §3.3).  Since then, this work has contributed an impressive number of ideas, concepts, and terms to later Daoist works (Robinet 1983). These include the “fasting of the mind” (xinzhai; ch. 4; Watson, 54–58) and the “sitting and forgetting” (zuowang; ch. 6; Watson, 90–91), two expressions that in later Daoism denote methods of self-cultivation, but in the Zhuangzi describe the inner state of the realized person. (For the view that they refer to actual practices also in the Zhuangzi, see Roth 1997.)