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Those who know don't talk about it; those who talk don't know it.

He blocks up his holes,
Closes his doors,
Softens the glare,
Settles the dust,
Files down the sharp edges,
And unties the tangles.
This is called Profound Union.

Therefore, there is no way to get intimate with him,
But there is also no way to shun him.
There is no way to benefit him,
But there is also no way to harm him.
There is no way to ennoble him,
But there is also no way to debase him.
For this very reason he's the noblest thing in the world.