Blurts & Spasms

Basically Aquinas argues from the position that — logically, intuitively, observationally, analogically — there can't be an infinite regress of causes, and he does this along several lines of reasoning. In essence, in order for God to be God, that prime mover can’t have a preceding cause. It would negate the primacy (and thus the divinity) of that mover. To appreciate both the context and the details of his arguments, it would be helpful to read the entirely of his discussion on the existence of God at the beginning of Summa Theologiae. You can read that online here: The existence of God (Prima Pars, Q. 2)