The First Way: Argument from Motion
1. Our senses prove that some things are in motion
2. Things move when potential motion becomes actual motion (potentiality vs. actuality)
3. Only an actual motion can convert a potential motion into actual motion
4. Nothing can be simultaneously in potentiality and actuality
5. Therefore, nothing can move itself
6. Each thing in motion is moved by something else
7. There is a first mover, put in motion by nothing else, understood to be God