1) Chinese philosophy 2) Taoist cosmology 
Neidan, or internal alchemy ({zh|t=內丹術|p=nèidān shù|s=內丹术}), is an array of esoteric doctrines and physical, mental, and spiritual practices that Taoist initiates use to prolong life and create an immortal spiritual body that would survive after death. Also known as Jindan (`golden elixir`), inner alchemy combines theories derived.....