I answer that, It sufficiently appears at the first glance, according to what precedes (Article [1]), that to create can be the action of God alone. For the more universal effects must be reduced to the more universal and prior causes. Now among all effects the most universal is being itself: and hence it must be the proper effect of the first and most universal cause, and that is God. Hence also it is said (De Causis prop., iii) that "neither intelligence nor the soul gives us being, except inasmuch as it works by divine operation." Now to produce being absolutely, not as this or that being, belongs to creation. Hence it is manifest that creation is the proper act of God alone.
It happens, however, that something participates the proper action of another, not by its own power, but instrumentally, inasmuch as it acts by the power of another; as air can heat and ignite by the power of fire. And so some have supposed that although creation is the proper act of the universal cause, still some inferior cause acting by the power of the first cause, can create. And thus Avicenna asserted that the first separate substance created by God created another after itself, and the substance of the world and its soul; and that the substance of the world creates the matter of inferior bodies. And in the same manner the Master says (Sent. iv, D, 5) that God can communicate to a creature the power of creating, so that the latter can create ministerially, not by its own power.
But such a thing cannot be, because the secondary instrumental cause does not participate the action of the superior cause, except inasmuch as by something proper to itself it acts dispositively to the effect of the principal agent. If therefore it effects nothing, according to what is proper to itself, it is used to no purpose; nor would there be any need of certain instruments for certain actions. Thus we see that a saw, in cutting wood, which it does by the property of its own form, produces the form of a bench, which is the proper effect of the principal agent. Now the proper effect of God creating is what is presupposed to all other effects, and that is absolute being. Hence nothing else can act dispositively and instrumentally to this effect, since creation is not from anything presupposed, which can be disposed by the action of the instrumental agent. So therefore it is impossible for any creature to create, either by its own power or instrumentally---that is, ministerially.
And above all it is absurd to suppose that a body can create, for no body acts except by touching or moving; and thus it requires in its action some pre-existing thing, which can be touched or moved, which is contrary to the very idea of creation.
