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太一生水 水反輔大一， 是以成天。[地] 天地...也， 是以成神明。 神明復相輔也， 是以成陰陽。
The Great One Gave Birth to Water. Water returned and assisted The Great One ("Taiyi"), in this way developing heaven and Earth. Heaven and earth repeatedly assisted each other, in this way developing the "gods above and below". The "gods above and below" repeatedly assisted each other, in this way developing yin and yang.
Commentators describe Taiyi as a representation of Heaven (James Legge), an impersonal "Watery Chaos" (Kong Yingda). At least one scholar (Medhurst) interprets this as the "Supreme One", possibly Shangdi.