There is a real mystery — an underlying “unfathomableness” as it were — in the fact of hylomorphism, insofar as neither form nor matter exists by itself; each is only one aspect of some thing. Form qua form — form as such — does not exist. And matter qua matter — matter as such — does not exist. And yet, every substance is a composite of form and matter! Neither of them, then, can be the rock-bottom reality of a thing: there must be an act of be-ing substance which “founds” any given thing — brings “reality” to this or that thing — which is then manifested in the form-matter composite. This is, perhaps, the very meaning of “creation from nothing”; form is nothing, matter is nothing, but together they are something.