 It is necessary with respect to everything that came into existence that before it came into existence, it was in itself possibly existent. For if it had not been possibly existent in itself, it never would exist at all. Moreover, the possibility of its existence does not consist in the fact that an agent could produce it or that an agent has power over it. Indeed, an agent would scarcely have power over it, if the thing itself were not possible in  itself.[7]