The Aristotelian Proof: Premise 16

Premise 16: But there could be such a differentiating feature only if a purely actual actualizer had some unactualized potential, which, being purely actual, it does not have.

Problem: Feser is assuming (or appears to be assuming) that if a PA (purely actual being) lacks some feature, then it could have that feature. But that is not the case for any other being. There are all sorts of features that I lack, but are such that I could not have them. I lack the feature of being a prime number, or of being a color, or of being incapable of thought, or of being non-human, … But it does not follow that those are potential features of me. None of them is a potentiality of mine. So, in general the following is false:

            For all substances x, if x lacks some feature F, then x is potentially F.

But Feser seems to think that the above principle is true for a purely actual being.


Question: Why?

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