Cultivation is to use Qi to transfer spirit.
Use the energy of heaven and earth to guide the human spirit, and use the crossing jade as a guide. When the spiritual energy is unified and reaches the upper realm, you can ascend to immortality. Demons have spirit but no spirit. Although they can exist in the world forever, they are invisible and can transform into all things. People have spirit but no spirit. They can exist in the world for a long time but cannot last long. According to legend, if a person voluntarily gives up his spirit before death, the demon can ascend after a thousand years of practice after obtaining the spirit. However, the person will turn into the energy of heaven and earth and will never be reincarnated. Therefore, few demons benefit from this method.
The so-called voluntariness is nothing more than asking others to fulfill unfinished things and unfulfilled wishes in this world at the cost of life after life.