tao te ching 14:
You can't see the invisible.
You can't name the fugitive.
You can't hear what can't be heard.
You can't grasp what you can't touch.
Now can you?
You can't avoid these qualities,
but you can't comprehend them, either.
They make a universe.
Tonight the sky is dark and the earth glows
as with moonlight.
A cord stretches from it to it, and returns and returns.
What is the substance of emptiness,
the form of the shapeless?
Confront it and its face evades you.
Follow it and its back disappears.
But still the ancients moved with the Tao into presence.
Stay connected to the origin.
That's Tao's cord.