Every contingency is brought into being from a state of affairs in which it does not actually exist; from a condition of things in which it is nowhere to be found. And as this is true of each contingency, so therefore is it true of all contingencies, and of the whole lot of them taken together. Contingent being as such comes into being from a prior state of its own non-being.
In a state of affairs in which there are no contingent beings, there is nothing but necessary being. If contingent beings are to be brought into existence from this state of affairs, there are only two possibilities: either they are made from God, and he furnishes from his own actuality the matter of their becoming; or he creates them from nothing. If the former, then, as departments of God, contingencies are in fact necessities. They aren’t contingent in the first place. This is monism. It radically contradicts experience as such, which it has no alternative but to declare our lives illusory and radically unintelligible. So it can’t be true: we can’t really even think it might be true.
Creatio ex nihilo must therefore be true. Having come into existence from nothing turns out to be an inherent aspect of contingent being.