(Principles of the Innate Disposition and the Lifespan) is considered a Summa of physiological alchemy. Its title combines two fundamental concepts:
For the original Chinese illustrations/text, use Internet Archive and the Chinese characters 性命圭旨 . For an accurate English version, purchase the Lü Pengzhi translation – it's the gold standard and supports further scholarly work. xingming+guizhi+pdf+hot
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Inner nature, fundamental being, or spiritual endowment. or spiritual endowment.