In the center of compassion is the place of union, Inside the Mysterious Gate is the realm of yao-chi. Lock up the monkey and ape so they cannot run away. Tame the wild horse so that it cannot get out of control. Grasp the opening of the Gate and when cultivation is complete, The beam of golden light will penetrate your entire being.
Source: commentary on T'ai Shang Ch'ing-ching Ching, written in Six Dynasties Era (220-589 AD), p 31-32
Contributed by: Zaady