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TAO can be talked about, but not the Eternal Tao.
Names can be named, but not the Eternal Name.

As the origin of heaven-and-earth, it is nameless:
As "the Mother" of all things, it is nameable.

So, as ever hidden, we should look at its inner essence:
As always manifest, we should look at its outer aspects.

These two flow from the same source, though differently
named;
And both are called mysteries.

The Mystery of mysteries is the Door of all essence.