
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 Impossibility of Being Both in Potency and in Act
"You can't both be here and not here at the same time," Aquinas says. "It's impossible for something to be both in potency and in act in the same respect." He adds that if a thing is self-mover, then it has to be moved by another. 'I'm moving around right in front of you or this horse is moving itself,' he argues.
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