The urn is used to hide the soul, the coffin is used to nourish the body, the bones are used to cultivate longevity, and the burial is used to enlighten the Tao.
Between heaven and earth, after death of all living beings, their souls disperse into reincarnation and their bodies return to dust. Only the urn burial lineage can seal the spirit, luck, and cultivation of the deceased, and even reverse the cycle of life and death.