The postcelestial Breath is the Breath that circulates internally: one exhalation, one inhalation, once coming, once going. "Exhaling touches onto the root of Heaven, inhaling touches onto the root of Earth. On exhaling, 'the dragon howls and the clouds rise'; on inhaling, 'the tiger roars and the wind blows.'"
When [the postcelestial Breath] is "unceasing and continuous," it returns to the Ancestral Breath. The internal and the external inchoately merge, and coalesce to form the Reverted Elixir (huandan).
▶ Quoted from Commentary on the Mirror for Compounding the Medicine: A Fourteenth-Century Work on Taoist Internal Alchemy, by Wang Jie, page 7— Read more on and from this book
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