(A) "Being" is a perfection
(B) "Maximal greatness" is a perfection
(C) If a property is a perfection, it's negation is not a perfection
(D) If a property Q is a necessary condition for a perfection P, Q is a perfection
(E) Logically contradictory statements are false
(1) It is proposed that a being has maximal excellence in a given possible world W if and only if it is omnipotent, omniscient and wholly good in W; and
(2) It is proposed that a being has maximal greatness if it has maximal excellence in every possible world.
(3) If a maximally great being does not exist, a maximally great being's existence is impossible
(4) If it's impossible that a maximally great being exists, every being has the property of "limited greatness".
(5) If every being has the property of "limited greatness", the property of "limited greatness" is a necessary condition for all beings.
(6) The property of "limited greatness" is a perfection (from 3,4,5,A and D)
(7) The property of "limited greatness" is not a perfection (from B and C)
(8 The statement "a maximally great being does not exist" is logically contradictory (from 6 and 7)
(9) A maximally great being exists (from 8 and E)
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