Xuanzang: Xuanzang means deep. Xuanzang also refers to the valley. The mountain is male, and the valley is the female reproductive organ of all animals. Xuanzang symbolizes the subtle and invisible reproductive organs that produce everything.
Here, the noumenon and function of Tao are explained. Tao is nothingness, use is creation. It is precisely because Tao is nothingness that it can last forever and its function can be endless. If it is alive, it will definitely die. If it is an entity, it will certainly die sometimes.
This is a sacred book of "self-cultivation" and "cultivation". Keep in good health, use internal strength, and "keep one", and use your deep energy and information to open up the road of harmony between man and nature. "repair", forget one's roots, enter the vast expanse, and achieve "harmony between man and nature"