My aim is to examine how we could consistently understand Tasan’s theory
of Zhongshu(忠恕) with that of self-cultivation, especially “Daoxin”(道心)
which, according to him, makes it possible to do moral action. First of all,
Tasan said that shu(恕), “Never do unto others what you would not like”(其所
不欲, 勿施於人) is not a principle of obligation to others, but ourselves,
namely for self-cultivation. In his view, our moral mind “Daoxin” commands
us like ‘Never do unto others,’ when “rinxin”(人心) desires. Second, Tasan’s
critique toward Zhuxi’s theory of Zhongshu(忠恕) is based on his theory of
weifa(未發). Third, The moral mind of Tasan is the inner heavenly command,
and the goodness of the act takes place through this moral mind. I argue that
the inner voice that commands “do not desire” (or “do not”), is included in the
principle of shu. Through the above, I tried to show that the concept of shu is
presented as a principle of self-discipline through weifa(未發)·yifa(已發) and
does not act independently from the inner voice of moral mind.