Neidan

Neidan, or internal alchemy (), 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 (金丹 "golden elixir"), inner alchemy combines theories derived from external alchemy (waidan 外丹), correlative cosmology (including the Five Phases), the emblems of the Yijing, and medical theory, with techniques of Taoist meditation, daoyin gymnastics, and sexual hygiene. In neidan, the human body becomes a cauldron (or "ding") in which the Three Treasures of Jing ("Essence"), Qi ("Breath") and Shen ("Spirit") are cultivated for the purpose of improving physical, emotional and mental health, and ultimately returning to the primordial unity of the Tao, i.e., attaining Taoist Immortality. It is believed the Xiuzhen Tu is such a cultivation map. In China, it is an important form of practice for most schools of Taoism. The Chinese compound nèidān combines the common word nèi meaning "inside; inner; internal" with dān "cinnabar; vermillion; elixir; alchemy". The antonym of nèi is wài "outside; exterior; external", and nèidān "internal elixir / alchemy" was coined from the earlier complementary term wàidān 外丹 "external elixir / alchemy". Traditional Chinese medical alchemical texts and sources ordinarily call neidan the jīndān dào 金丹道 or Way of the Golden Elixir. In Modern Standard Chinese usage, the term nèidān shù 內丹術 (with "art; skill; technique; method") refers generally to internal alchemical practices for longevity by maintaining good health, and the prevention of pain and suffering. The date for the earliest use of the term neidan is uncertain. 內丹 or neidan had been mentioned in 灵剑子 by Xu Xun 许逊 in Jin dynasty (266–420) , but in the other hand Arthur Waley proposed that it was first recorded in the 559 vow taken by Tiantai Buddhist patriarch Nanyue Huisi praying to successfully make an elixir that would keep him alive until the coming of Maitreya.