Guo Xiang is a key person in the development of Weijin Metaphysics.It was he who brought forward the theory of "suiting one's nature".Guo Xiang pointed out the autogeny of things.He deemed the "life"of things is unchangeable.So all things must suit one's nature.We can feel the realm of being of the same body of Guo Xiang's theory of "suiting one's nature".This realm reflects harmony,duty,respect and equality.