yin and yang in huainanzi chapter 3
‘When Heaven and Earth were yet unformed, all was ascending and flying, diving and delving. Thus it is called the primal beginning. The dao begins in the nebulous void. The nebulous void produces space-time; space-time produces the primordial qi.
A shoreline (divides) the primordial qi. That which is pure and bright spreads out to form heaven; the heavy and turbid congeals to form earth. It is easy for that which is pure and subtle to disperse, but difficult for the heavy and turbid to congeal. Therefore, first heaven is completed, and then earth fixed.
The combined essences of heaven and earth produce yin and yang. The successive essences of yin and yang cause the four seasons. The scattered essences of the four seasons create the ten thousand things.’ Read more