Aquinas' argument appeals to events that we see and experience in the universe (change,cause, contingent beings).
Because the argument is based on experience, it is an a posteriori argument and it is inductive.
Rejection of infinite regress- Contingent beings are temporary since at some point they come into existence and at some point will go out of existence. Contingent beings cannot regress infinitely as they are temporary by nature. The only explanation for existence of contingent beings is a necessary being. Infinite regress is to deny any final explanation. The choice is between no explanation (infinite regress) and explanation (what Aquinas called God).
Each of Aquinas' 3 arguments concludes in the existence of a being which is what he understands to be God.
God is not one more in a line of movers or causers. God is of a totally different order and not subject to the same conditions as the universe.
The arguments do not attempt to fill out or demonstrate the whole nature of God. Aquinas concluded that the unmoved mover/uncaused causer/necessary being must describe God.
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