Shall we say that what thus exists potentially is potentiality in
respect of what is to be; as, for instance, that the metal is the
potentiality of a statue? Not so, if we refer to the producing
potentiality; for the producing potentiality cannot be said to exist
potentially. If, then, we identified existing potentially not only with
existing actually, but also with actuality, then potentiality would
coincide with potential existence. It would be better and clearer,
therefore, to contrast potential existence with actual existence, and
potentiality with actuality. The thing which thus exists potentially is
the substance underlying the reactions, shapes and forms which it is
naturally fitted to receive, to which it aspires for their betterment
or deterioration, and for the destruction of those whose actualization
constitutes differentiation.