Master Dogen wrote on Time (in Being-Time, Uji) ...
See each thing in this entire world as a moment of time.
Things do not hinder one another, just as moments do not hinder one another. ...
Each moment is all being, is the entire world.
Reflect now whether any being or any world is left out of the present moment.
This is an important piece in the whole puzzle.
What he is talking about is the concept of "all is one".
But if there'a a "one", don't there have to be a "zero"?
That's where nothing comes in...