can't say that mountains are mountains

​Question:  Is it correct to phrase things as follows?  The belief in substantiality is the belief in the thing called a thing—the thing itself.  The belief that there is such a thing as a thing.  The sentence looks absurd as I type it—but my point is, before we start saying statements like “this is a cup, that is a book”—underneath those phrases is the belief that there actually are things—any things—that a thing itself is even a possibility in Reality.  So, to go on, a thing is never more than a concept.  And to go on, there appears to be no sign of a thing in Reality—there is no evidence of a thing.  In other words, (and to play with this a little) Reality doesn’t speak English! It doesn’t deal in things.  Ultimately this is why things, when entertained, seem mysterious (linking back to my question posted on Feb 28).  Their mysterious[ness] stems from their unreality.
 
Response:  Yes, the belief in substantiality is simply the belief that there actually is Something rather than Nothing.  Though I won’t say that I disagree with anything you’ve written above, I might have worded things a little differently.  At a minimum, I would have changed your final word to “nonsubstantiality.”