From the Secret of the golden Flower

 The whole work of turning the light around uses the

method of reversa1. The beauties of the highest
heavens and the marvels ofthe sublimest realms are
all within the heart: this is where the perfectly open
and aware spirit concentrates. Confucians call inhe
open center, Buddhists call it the pedestal of awareness, Taoists call it the ancestral earth, the yellow
court, the mysterious pass, rhe prima) opening.
The celestial mind is like a house; the light is the
master of the house. Therefore once you turn the
light around, the energies throughout the body all
rise. Just turn the light around; this is the unexcelled
sublime truth.