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I answer that, We must hold that the will of God is the cause of things; and that He acts by the will, and not, as some have supposed, by a necessity of His nature.

This can be shown in three ways: First, from the order itself of active causes. Since both intellect and nature act for an end, as proved in Phys. ii, 49, the natural agent must have the end and the necessary means predetermined for it by some higher intellect; as the end and definite movement is predetermined for the arrow by the archer. Hence the intellectual and voluntary agent must precede the agent that acts by nature. Hence, since God is first in the order of agents, He must act by intellect and will.

This is shown, secondly, from the character of a natural agent, of which the property is to produce one and the same effect; for nature operates in one and the same way unless it be prevented. This is because the nature of the act is according to the nature of the agent; and hence as long as it has that nature, its acts will be in accordance with that nature; for every natural agent has a determinate being. Since, then, the Divine Being is undetermined, and contains in Himself the full perfection of being, it cannot be that He acts by a necessity of His nature, unless He were to cause something undetermined and indefinite in being: and that this is impossible has been already shown (Q. 7, A. 2). He does not, therefore, act by a necessity of His nature, but determined effects proceed from His own infinite perfection according to the determination of His will and intellect.