Whether the will of God is the cause of things?

Objections

Objection 1 : It seems that the will of God is not the cause of things. For Dionysius says (Div. Nom. iv, 1): "As our sun, not by reason nor by pre-election, but by its very being, enlightens all things that can participate in its light, so the divine good by its very essence pours the rays of goodness upon everything that exists." But every voluntary agent acts by reason and pre-election. Therefore God does not act by will; and so His will is not the cause of things.
Objection 2 : Further, The first in any order is that which is essentially so, thus in the order of burning things, that comes first which is fire by its essence. But God is the first agent. Therefore He acts by His essence; and that is His nature. He acts then by nature, and not by will. Therefore the divine will is not the cause of things.
Objection 3 : Further, Whatever is the cause of anything, through being "such" a thing, is the cause by nature, and not by will. For fire is the cause of heat, as being itself hot; whereas an architect is the cause of a house, because he wills to build it. Now Augustine says (De Doctr. Christ. i, 32), "Because God is good, we exist." Therefore God is the cause of things by His nature, and not by His will.
Objection 4 : Further, Of one thing there is one cause. But the created things is the knowledge of God, as said before (Question [14], Article [8]). Therefore the will of God cannot be considered the cause of things.