The core content of Endless Map is to explain the experience process of double cultivation in life. "Sex" refers to the nature of mind, and cultivation refers to the cultivation of mind, that is, the tempering of mind and spirit. "Life" refers to the vitality of life, which is the essence, spirit and vitality of human body. To cultivate one's life is to solidify essence and nourish qi. "Nourishing essence, nourishing spirit and refining qi are the gods of the three virtues." The Infinite Map does not talk about symbols and ghosts, but only talks about cultivating the three treasures (essence, qi and spirit), taking essence as the foundation of life, focusing on restraining the movement of body and mind to guide qi, and emphasizing the changing role of essence, qi and spirit. Chen Tuan said, "Little enlightenment, little old age, old illness, illness turns to death, and death turns to spirit. Deify everything, gasify everything, refine and shape. Essence, qi and spirit are turned into true immortals. " The "transformation" and "return" of refined spirit are outstanding manifestations of Chen Tuan's natural view that everything changes and matter changes from quantitative to qualitative.