the doctrine of the three treasures (sanbao), namely jing (essence), qi (vital energy/pneuma), and shen (spirit), which are the basic ingredients of the neidan process.
This passage establishes the Daoist neidan definition of the Three Treasures as the triadic ontological substrate—essence, vital energy, and spirit—each bearing primordial and conditioned aspects that the alchemical process seeks to restore.
, Daoism Handbook, 2000thesis