I find Aquinas’s argument totally unconvincing. There are two parts to this argument that are left out of the popular version. First, Aquinas argues that nothing can be its own cause. In order for something to be a cause of anything, it must already exist. So, if something were to be its own cause, it would have to exist before it exists — a obvious contradiction. His conclusion then, is not that God is self-caused, but rather tha