Aquinas's argument from simplicity to infinity is fallacious

Scotus ascribes to Aquinas the following argument for the divine infinity: If a form is limited by matter, it is finite. God, being simple, is not limited by matter. Therefore, God is not finite. This, as Scotus points out, is a fallacious argument. (It’s an instance of denying the antecedent.) But even apart from the fallacy, simplicity is not going to get us infinity. As Scotus puts it: “if an entity is finite or infinite, it is so not by reason of something accidental to itself, but because i