 The main focus of the Yangists was on the concept of "xing", or human nature, a term later incorporated by Mencius into Confucianism.The "xing", according to sinologist A. C. Graham, is a person's "proper course of development" in life.Individuals can only rationally care for their own "xing", and should not naively have to support the "xing" of other people, even if it means opposing the emperor.