Heaven and Earth...

Heaven and Earth last forever.
Why do heaven and Earth last forever?
They are unborn, so ever-living…

Thirty spokes share the wheel's hub;
It is the center hole that makes it useful.
Shape clay into a vessel;
It is the space within that makes it useful.
Cut doors and windows for a room;
It is the holes which make it useful.
Therefore benefit comes from what is there;
Usefulness from what is not there….

~ Lao Tzu in “Tao Te Ching”

[Read Heaven as un-manifest Space and Earth as manifest Gross]