The following two lines have to do with the activity of the pole of the Great Wain, the rise and fall of the whole release of polarity. Water is the trigram of the Abysmal; the eye is the wind of the Gentle (Sun). The light of the eyes illumines the house of the Abysmal, and controls there the seed of the great light. "In heaven" means the house of the Creative (Ch’ien). "Wandering in heaven, one eats the spirit-energy of the Receptive". This shows how the spirit penetrates the energy, how heaven penetrates the earth; this happens so that the fire can be nourished.
Translators of The Secret of the Golden Flower are Richard Wilhelm and Cary F. Baynes. If you missed any posts in this series, please utilize the Golden Flower label below.