Man's strength, weakness, slowness, quickness, and talent or lack of talent are due to the one-sidedness of the material force. Heaven (Nature) is originally harmonious and not one-sided. If one cultivates this material force and returns to his original nature without being one-sided, one can then fully develop his nature and [be in harmony with] Heaven. Before man's nature is formed, good and evil are mixed. Therefore to be untiring in continuing the good which issues [from the Way] (1) is good. If all evil is removed, good will also disappear [for good and evil are relative and are necessary to reveal each other]. Therefore avoid just saying "good" but say, "That which realizes it (the Way) is the individual nature.” (2)
(Chang Tsai)
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