The Tao that can be told is not the eternal Tao. 

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The Dao is known by it's ineffible emptiness. When a bell is struck it rings, when a drum is beaten it resounds. This is because they are solid outside and empty within. It is because they have nothing inside that they are able to ring and resound.

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"There is nothing better than to know that you don't know. "

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"The Dao does nothing,
but leaves nothing undone.
If the powerful men
could observe it,
all creations would be transformed
by themselves."