The core of the literary proposition of the public security school in Ming Dynasty is

Theory of mind. The core of the literary proposition of the public security school in Ming Dynasty is the theory of spiritual nature. Soul theory, verve theory, mode theory and texture theory are the four major poetic theories in the early Qing Dynasty. It is generally believed that Yuan Mei's theory of soul is his poetic theory. In fact, it is the inheritance and development of the poetic theory of "expressing one's own spirit and not sticking to one pattern" represented by the public security school in Ming Dynasty (Xiao Xu Shi Xiu by Yuan Hongdao).