陽之首,故爲朝,用屯卦直事。午時起陰符,午爲六陰之元,故爲昏,用蒙卦直事。故曰屯蒙作則動靜在朝在昏也。一日一夜,兩卦直事,三十廿,計六十卦,屯蒙爲六十訃之始,旣未爲六士卦之終,終而復始,始而復終,故曰旣未,愼萬物之終始也。夫脩金丹,先以眞陰眞陽之物立爲爐鼎,然後誘太極一氣爲丹。太極之氣,苟不以眞陰眞陽之物而誘之,則不能降靈象。是以叅同契立乾坤二卦爲爐鼎,分坎離爲藥物,處於中宫,其餘諸非,分在一月十日內,以運符火。故乾坤者,龍虎也;震兌者,大婦也,魂魄也;坎離者,鉛汞也,水火也,男女也,日情也。觸類而表之,則不可勝紀矣。原其至當而言之,無過比喻眞陰眞陽之物也。以此二物合氣於中宫黃道之室而成丹,故曰守中則黃裳元吉也。旣得丹仰,非火無以有其聖胎,是以運元陽之氣爲火,火無定位,周流六虛,故曰遇亢則無位而尊也。夫曰出爲書日没爲夜,聖人運動符火,於一日夜之中,分擘陰愓寒暑之氣,外應大符,內合榮衛,消長一身,抽添運用,溫養子珠,故曰日出没,合榮衛之寒溫也。夫天生水,在人曰精;地生夾,在人曰神。人之精神榮衛身當與天地、陰陽、四時

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

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