Can God create a rock so heavy that he can't lift it?

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This is a rather silly conundrum designed to show that "omnipotent" is actually a meaningless term.

Omnipotent means "all-powerful". If God can do everything, then He should be able to create such a rock. But once the rock is created, He should also be able to lift it, which contradicts the first claim.

This is reminiscent of a story about a medieval arms salesman who boasted that his sword was so sharp that it could penetrate any armor, and his shield was so tough that it could withstand any attack. A member of the crowd called out, "What happens when you strike your sword against your own shield?" The salesman was stumped.

The answer is that the salesman was lying about one of his products. Or to put it another way, a perfect sword and a perfect shield cannot exist simultaneously. If there exists any sword that can penetrate all shields, then by definition there does not exist any shield that can withstand all attacks.

Similarly, there cannot exist a rock that cannot be lifted in a universe that also contains a God who can lift anything. Yet this proves that there is something that God cannot create.

How do we get out of the paradox? An atheist would answer that the very idea of being "all-powerful" is meaningless and not worthy of consideration in the real world. However, apologists often respond that "all-powerful" means "God can do everything... that is logically possible."

This is indeed a plausible way out of the paradox, although it is noteworthy that there is no solid understanding of what is logically possible when speaking about a God who regularly performs miracles. See the entry on omnipotence for further discussion of what God apparently cannot do.

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