Chen Tuan said, "There is no other way to cultivate metaphysics. You just need to be too ignorant and realize where you are ordered, but cultivate it, support it and protect it. So in the final analysis, you can resume your life or you can not concentrate. " The thought of "paying attention to oneself" is consistent with that of Sima Chengzhen, a Taoist priest in the Tang Dynasty, and both originated from Zhuangzi's philosophical thought. "Zhuangzi on Earth": "If you are determined, don't listen to your ears, but listen to your heart; Don't listen with your heart, listen with your breath. ..... gas also, empty and treat things also. Only the Tao is empty. If you are empty, your heart will fast. " If you can forget yourself and concentrate, you can forget everything, enter the immortal realm, be one with Tao, be one with everything in the world, and return to the truth.