Meaning of 玄之又玄

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xuán zhī yòu xuán
mystery within a mystery; the mysteries of the Dao according to Laozi 老子
Example Sentences
I cannot forecast to you the action of Russia. It is a riddle wrapped in a mystery inside an enigma: but perhaps there is a key. That key is Russian national interest.
Some of them sound pretty dizzy, like they've spent too much time at a high elevation .
Practice has proved that the medical feature of Taoist music should be valued. And it is also a cultural heritage modern civilization and science should actively carry on and develop.