That it belongs to God alone to create Since the order of actions is according to the order of agents, and the action is nobler of the nobler agent, the first and highest action must be proper to the first and highest agent. But creation is the first and highest action, presupposing no other, and in all others presupposed. Therefore creation is the proper action of God alone, who is the highest agent.
Effects answer proportionally to their causes.
Thus actual effects we attribute to actual causes, potential effects to potential causes, particular effects to particular causes, and universal effects to universal causes. Now the first thing caused is 'being,' as we see by its presence in all things. Therefore the proper cause of 'being,' simply as such, is the first and universal agent, which is God. Every agent that acts as an instrument completes the action of the principal agent by some action proper and connatural to itself, as a saw operates to the making of a stool by cutting. If then there be any nature that operates to creation as an instrument of the prime creator, this being must operate through some action due and proper to its own nature.