五行還返

萬物之理，歸於母則根深蔕固，有長久之道；散於子，則花榮葉茂，有衰謝之理。子謝母衰者，五行之順行也；長生久視者，五行之不順行也。至人於中宫神物造化之際，造物既功，則子隱母腹，母含子胎，致龍出於火，虎生於水，有還返顛倒之理。

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Text and scans: Shidian Guji (Peking University – ByteDance open ancient texts). Edition details are given per book. Shidian Guji