A few months ago over at the Catholic apologist's site Strange Notions, where I sometimes debate theists (but am now banned from), a post was written by Catholic philosopher Dr. Dennis Bonnette that was almost entirely addressed at some criticisms I've made on the site in the past year.
God Possesses Free Will
Still, since the positive perfection of intellect is found among creatures, God must possess intellect – for God could not create finite intellects unless he possesses that perfection himself. Just as the intellect knows being as the true, the intellectual appetite desires being as the good. The intellectual appetite is called “will.” Thus God must have will as well as intellect. In fact, the divine simplicity requires that his will is identical with his intellect.
First, non-intellect can "create" intellect. This is in fact what science demonstrates. Higher order intelligence emerges from lower order non-intelligence. Every single piece of data we have from science demonstrates this, from the fact that thoughts are encoded in the brain and can be read by external parties before subjects become consciously aware of them, to the fact that all the laws of physics that deal with the everyday realm (which includes all of human behavior) are known and there is no room for external forces not in the Standard Model and gravity to have any influence over us, and to the fact that memories can be seen forming in the brain. It is a false creationist trope to argue that only intellect begets intellect. Secondly, what exactly is being claimed when Dr. Bonnette says, "the intellect knows being as the true"? Is this some truism? This is hardly a justification of god's will and intellect. Blind, unintelligent forces can result in intelligence. So no argument Bonnette makes here works. He continues, including a quote from Aquinas:
It may seem odd, but it is possible to have a will that is moved necessarily toward certain objects. For example, God wills his own goodness necessarily. As St. Thomas Aquinas puts it:
“The divine will has a necessary relation to the divine goodness, since that is its proper object. Therefore, God wills the being of his own goodness necessarily, just as we will our own happiness necessarily….”1Thus, the notion of will itself, as the intellectual appetite for the good, is not inconsistent with an absence of free choice.
How can god will his own goodness necessarily, if god defines goodness? God could will anything and it would be called "good" by definition on the scholastic view. There'd have to be an objective standard independently of god for us to be in any position to know what goodness god would necessarily will. Think about it: if we were confronted with 5 different theists who each believed in a different god that had a radically different will and we were generically told "God wills his own goodness necessarily," how would we know which of the 5 gods, if any, actually willed goodness? We also don't will our happiness necessarily, we have the strong tendency to do so. Aquinas is also, if you didn't notice, just defining god's will as good. All Thomism fundamentally is, is defining things into existence.