Aquinas’s ‘First Way’ Argument: In What Way Does it Prove God’s Existence? | Prof. Gregory Doolan
The Thomistic Institute
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The First Stage of Aquinas
In the first stage, Aquinas proves to us that whatever is moved, whatever undergoes change has to be moved or changed by something else. And so he's going to conclude that there must be a first unmoved mover. That is, in turn, the cause of motion in everything else, it is entirely unmoved. Motion is its proper effect or the effect of motion that we observe leads us back to some being that merits the name God.
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