Pregadio's interpretation of the next four lines:   The “earthly po-soul” is True Yang found within Yin; it is the precelestial Original Essence of which the physical body is a Yin manifestation. Analogously, the “celestial hun-soul” is True Yin found within Yang. It is the precelestial Original Spirit of which the thinking mind is a Yang manifestation. The “Mercury in the Vermillion” is True Mercury, or True Yin within Yang. It is found within Fire, which is represented in alchemy by native cinnabar. The “Metal in the Water” is True Lead, or True Yang within Yin. In the system of the five agents, Metal is found within Water. In the post-celestial world, the Yang principle tends to rise to Heaven and vanish above, causing the loss of True Yin; the Yin principle tends to descend into the Earth and be wasted below, causing the loss of True Yang. To avoid this, the pre-celestial po-soul (True Yang) should control the Yin principle (the Mercury in the Vermillion), and the pre-celestial hun-soul (True Yin) should restrain the Yang principle (the Metal in the Water).   And my simplification from this of Zhang Boduan's lines:   Just let the (True Yang found within Yin/original essence) seize the (True Yin within Yang/pre-celestial Original Spirit), and you will have the (True Yin within Yang/pre-celestial Original Spirit), controlling the (Yang principle/?).   Original Spirit should control original essence, True Yin should control True Yang.    One line of Pregadio's commentary I found particularly interesting was that "It is the pre-celestial Original Spirit of which the thinking mind is a Yang manifestation." True Yin controls the thinking mind. What does True Yang control? According to Pregadio, True Yang created the physical body, so True Yang controls matter?     
    • Like
    2