性善论的出现并非偶然,它是早期儒家学说体系化过程的必然结果。这个过程可分为三个阶段:儒学的体系化、德行的内向化和德目的简约化,具体表现为五行说的形成,从五行说到四端说,再从四端说到性善论。 The emergence of the theory of good nature is not accidental, it is the inevitable result of the systematic process of early Confucianism. This process can be divided into three stages: the systematization of Confucianism, the introvert of moral virtue and the simplification of moral purpose. The concrete manifestation is the formation of the Five Elements theory.