1. The First Cause (Cosmological) Argument

2. The Argument
Famously put forward by St Thomas Aquinas in his Summa Theologica
It is an a priori argument
He presented Five Ways to prove the existence of God – this covers 3 of them
The Way of Motion (everything we experience ‘moves’); The Way of Causality (all things are caused to ‘move’); The Way of Potentiality (all of these things we experience are contingent)
He believed there had to be a First Cause which was ‘necessary’ in order to start off the chain of causes that resulted in the universe.
This First Cause had to be a necessary being who did not require a cause (God).