...it's either everything, or it's nothing...

Questioner: If the unconditioned cannot be experienced, for all experience is conditioned, then why talk of it at all?
Maharaj: How can there be knowledge of the conditioned without the unconditioned? There must be a source from which all this flows, a foundation on which all stands. Self-realization is primarily the knowledge of one's conditioning and the awareness that the infinite variety of conditions depends on our infinite ability to be conditioned and to give rise to variety. To the conditioned mind the unconditioned appears as the totality as well as the absence of everything. Neither can be directly experienced, but this does not make it non-existent.
   - I Am That

I have pondered the concept of infinity at length in my life - it is probably the single most potent concept that rattles around in my head.  I agree that if we accept that infinity is (which I absolutely do), then it is reasonable to deduce that the unconditioned also is, noting that the word is is totally inadequate in both of these clauses. Nonetheless, I find no support for either the claim that knowledge of the conditioned must imply the unconditioned, or that there must be a source from which "all this" flows. Still, I think I sort of see the perspective of the overall, even if the translation may have been severely challenged: obviously, an existent unconditioned is an oxymoron.