玄之又玄

xuán zhī yòu xuán

Meaning

mystery within a mystery; the mysteries of the Dao according to Laozi 老子[Lao3 zi3]

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Characters

玄xuándeep, profound, abstruse亠幺之zhīmarks preceding phrase as modifier of following phrase; it, him her, them; to go to丶又yòuand, also, again, in addition