I'll just point out to start that Aquinas' famous "5 proofs for the existence God" where all logically flawed ,so he is probably not a particularly good place to start.Djevv said:This section concerns what we were talking about:
'One sense of ‘omnipotence’ is, literally, that of having the power to bring about any state of affairs whatsoever, including necessary and impossible states of affairs. Descartes seems to have had such a notion (Meditations, Section 1). Yet, Aquinas and Maimonides held the view that this sense of ‘omnipotence’ is incoherent.
Nevertheless....
Good so far. Employing the law of noncontradiction.Their view can be defended as follows. It is not possible for an agent to bring about an impossible state of affairs (e.g., that there is a shapeless cube), since if it were, it would be possible for an impossible state of affairs to obtain, which is a contradiction (see Aquinas, Summa Theologiae, Ia, 25, 3; and Maimonides, Guide for the Perplexed, Part I, Ch. 15).
This is classic circular reasoning,or begging the question.Nor is it possible for an agent to bring about a necessary state of affairs (e.g., that all cubes are shaped). It is possible for an agent, a, to bring about a necessary state of affairs, s, only if possibly, (1) a brings about s, and (2) if a had not acted, then s would have failed to obtain. Because a necessary state of affairs obtains whether or not anyone acts, (2) is false. As a consequence, it is impossible for an agent to bring about either a necessary or an impossible state of affairs. Obviously, an agent's having the power to bring about a state of affairs entails that, possibly, the agent brings about that state of affairs. Thus, the first sense of ‘omnipotence’ is incoherent. Henceforth, it will be assumed that it is not possible for an agent to have the power to bring about any state of affairs whatsoever.'
premise (1) assumes 'agents' bring cubes into existence.But this is not yet established.
Moreover,this is what most theologian apolgists don't get about ontology.It is the observer (ie humans in our case) that gives a thing it's identity,its "thingness".This is employing the same basic logic that the author starts with when he employs the law of non-contradiction,the law of identity A=A is directly related to it.But he ignores it.
Humans actually define what is a "necessary state of affairs" for a thing to be a cube.If it : "a solid bounded by six equal squares, the angle between any two adjacent faces being a right angle." then we give it the identity of cube.
There is no actual objective cube "out there".You yourself actually pointed to this problem a few posts back with the "squared circle"
So in my opinion he hasn't established that God's omnipotence should be considered limited with that argument.It fails by commiting a logical fallacy and misunderstanding of "existence" ie ontologically.
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