The subtle essence of the universe is eternal.

It is like an unfailing fountain of life which flows forever in a vast and

profound valley.

It is called the Primal Female, the Mysterious Origin.

The operation of the opening and closing of the subtle Gate of the Origin

performs the Mystical Intercourse of the universe.

The Mystical Intercourse brings forth all things from the unseen sphere into

the realm of the manifest.

The Mystical Intercourse of yin and yang is the root of universal life.

Its creativity and effectiveness are boundless.