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Castiel wanted to ask this question from a biblical basis:

Can God kill himself ? I mean, if he can kill himself, he isn't immortal and if he can't, he have not unlimited power...

The question here is, what is the Catholic understanding of omnipotence? How do Catholics address the apparent contradiction that God cannot be omnipotent if he cannot kill himself and he cannot be immortal if he can kill himself?

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St. Thomas Aquinas holds that God can do anything except whatever implies a contradiction.

Treating "Whether God is omnipotent?," he writes:

[T]his phrase, "God can do all things," is rightly understood to mean that God can do all things that are possible; and for this reason He is said to be omnipotent.

and

[N]othing is opposed to the idea of being except non-being. Therefore, that which implies being and non-being at the same time is repugnant to the idea of an absolutely possible thing, within the scope of the divine omnipotence. For such cannot come under the divine omnipotence, not because of any defect in the power of God, but because it has not the nature of a feasible or possible thing. Therefore, everything that does not imply a contradiction in terms, is numbered amongst those possible things, in respect of which God is called omnipotent: whereas whatever implies contradiction does not come within the scope of divine omnipotence, because it cannot have the aspect of possibility. Hence it is better to say that such things cannot be done, than that God cannot do them.

Essentially, God cannot do "whatever implies contradiction" not because God lacks omnipotence but because a contradiction, itself, is no thing; it lacks being; it's unintelligible.

Geremia
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  • That's why God cannot sin/deny himself. Best and correct answer because directly from the Angelic Doctor. –  Feb 12 '15 at 06:46
  • "God can do all things," is rightly understood to mean that God can do all things that are possible [for him]. Which means ALL things/infinite ... not sure it makes a difference to me. –  Feb 12 '15 at 07:14
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    @FMS: You could say "God can do all things." Viz., "God cannot do/make no-thing." – Geremia Feb 12 '15 at 21:10
  • Better God cannot do/make no-Being. Relation with himself. But as regards no-being (small "b"), that's what creation is all about. He calls what did not previously exist into being and none fails to answer. They would instantly vanish to nothingness (their being) if he so wished. –  Feb 13 '15 at 01:44
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    @FMS: I mean that it's a contradiction to create something ex nihilo that has no being, since to create means to bring forth a being, not a non-being. – Geremia Feb 13 '15 at 20:45
  • Somewhat similar to FMS's second comment, but I'd like to refine it just a little more: The scriptures say "...with God all things are possible." (Matt 19:26) and "...nothing is impossible with God" (Luke 1:37). Does St. Thomas address these texts in this context and if so, how can he reconcile them to the substance of what he is saying? – bruised reed Feb 24 '15 at 06:50
  • @bruisedreed ask as a separate question – Please stop being evil Apr 22 '15 at 16:30
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Omnipotence means that God can do anything. But "anything" does not include nonsensical strings of words, like "kill God" or "round square" or "a rock so heavy that God can't lift it". C.S. Lewis once explained this point by saying that nonsense does not make sense just because we say "God can" in front of it.

After this accelerated tour from atheism to Christianity, Lewis is ready for his main argument. He starts with God Almighty. What is the meaning of God's Omnipotence? Can he do whatever he pleases? Yes, except the intrinsically impossible. You may attribute miracles to him but not nonsense: "Nonsense remains nonsense even if we talk it about God." - Source - C.S. Lewis: The Problem of Pain | CERC.

Andreas Blass
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  • This is a good answer, but not a Catholic one. If this is the accepted answer, then I propose that the question is actually a duplicate of this one. – Flimzy Feb 11 '15 at 04:06
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    @FMS Thanks for finding and adding the C.S. Lewis passage. – Andreas Blass Feb 11 '15 at 22:21
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    Of course it's a Catholic answer, it's just not quoting a Catholic. Lewis was quite familiar with St. Thomas' writings and says the exact same thing he did. – zippy2006 Feb 25 '15 at 04:28