주희 성리학에서의 소이연과 소당연의 도덕 실재적 함의

The 『Ta Xue(大學)』 show that what the Way of going into the principles of rule over the world(平天下) from comprehension about essence of things(格物) is. Therefore, the perception a truth about ‘knowing the root(格物)’ and ‘the perfecting of knowledge(致知)’ just is a starting point of all these tasks. Zhu Xi has studied on the theme of the Oughtness(所當然) and the Being(所以然) in the part of the 『Ta Xue(大學』’s ‘knowing the root(格物)’ and ‘the perfecting of knowledge’. The ‘knowing the root(格物)’ and ‘the perfecting of knowledge(致知)’ means the cognition reason about why transformation of Being should be complied with the rule necessarily. All things has reason that it’s change cannot help just becoming so necessarily. It has the principle that should be done so necessarily, too. Therefore we can say that the Oughtness(所當然) and the Being(所以然) have a law(理) in its self. the Oughtness(所當然) is the transfiguration law which can never stop in everything’s change of structural space. In the meantime, the reason of Being(所以然) is the existence basis of the Oughtness(所當然) which can be never exchanged in everything’s change of structural space. These both of the Oughtness(所當然) and the Being(所以然) are in relation of two sides of the same coin, and this is forming inseverable all never. Therefore all things are sharing one principle(一理) that is one reason as common origin. As the Law of nature(理) is perfectly good one, the coexistent norm human society order principle has also always reasonable value. Human’s coexistent social behavior is action by the Oughtness(所當然) that everybody has innately. The Law of nature(理) that is common underlying reason from everything to universe just is virtuous(仁) in society relationship. Therefore, we can see a ‘what should be(當爲)’ and an ‘existence actual fact(存在事實)’ are one unification constituted with inside and outside in in the Zhu Xi’s NeoConfucianism.