P
Perplexity
Guest
I don’t think it’s clear what kind of causation Aquinas is working with here (there are multiple interpretations of these by different thomistic schools) but even granting that he’s working with essential causation, my objection stands:Your objection works against accidentally ordered series, but he was speaking of essentially ordered series and they cannot go infinitely deep. Why? There would be no motion/change because each member of the series is potential and requires an external force to actualize their potentials. If there is no first mover, the series cannot move. We do not arrive at God yet with this proof, and must be read in context of the other four.
In an infinite series of essential causation, each member of the series has an external force to actualize its potential. There doesn’t need to be a first mover.