 However, Zhuangzi repeatedly brings forth the issue of whether and how the Dao can be known. As the Dao is the absolute, it cannot be made an object; therefore its knowledge cannot be attained by the ordinary mind, which functions by establishing distinctions between “self and other”, “this and that”, “right and wrong”, and other relative concepts (ch. 2; Watson, 36–49). Zhuangzi’s analysis of the human mind is in fact an epistemology: since the Dao is ultimately unknowable through the ordinary mind, there is only one way to know it: through “the knowledge that does not know” (ch. 4; Watson, 58).