A person P is omnipotent at a time t if and only if he is able to bring about any logically contingent state of affairs x after t, the descriptions of which does not entail that P did not bring x about at t. This is subject to the restriction that a person is no less omnipotent for being unable to bring about a state of affairs if he believes that he has overriding reason not to bring it about. So, God is omnipotent even if he is unable to do what he believes wrong. The paradox of the stone has false premises.
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