Yeah, but it’s the part that, without which, your theory of “existence being infinite” would be rendered meaningless.
I mean, imagine that you could somehow add up all of the tangibly existent features of what we call “reality”; – features such as all of the life, mind, and matter implicit in this image…
…or all of the life, mind, and matter that is implicit in the possibility of there being a multiverse, as depicted in this image…
Furthermore, as you are adding all of that up, don’t forget to include all of the possible existent features of any transcendent realms (e.g., heavens and hells, etc.) that might possibly exist.
Now, after you have somehow accounted for every “tangible” feature of the “ALL-THAT-IS,” do you honestly believe that the sum-total of those tangible and existing features of, again, the “ALL-THAT-IS,” would be “INFINITE” without the inclusion of the “absolute nothingness” that the tangible features of reality are expanding into?
Let me answer that for you.
Comparing the sum-total of everything you added up in the little thought experiment above; – comparing that to the absolute and infinite nothingness that the tangible “somethingness” of reality is expanding into,…
…wouldn’t even rise to the level of insignificance in comparing the tiny dot between these two brackets [ . ] to that of the 93 billion light-year diameter of the universe.
Again, it (the absolute nothingness) is not just a part of existence that is being “construed” as being infinite, no, it is the only part of existence that truly is infinite.
And, again, without which, your theory would be rendered meaningless.