asaris

They're not all the same -- in fact, if two possible worlds are the same, they're the same possible world. But if a fact is necessarily (like, relatively uncontroversially, 2 + 2 = 4), it's true in all possible worlds. So, for example, there's a subset of possible worlds in which I exist. There are some possible worlds where I don't exist. But in all possible worlds, the statement "For all x, if x is a man, x is mortal" is true. Similarly, the Ontological Argument attempts to prove that the statement "God exists" is necessarily true.

My roommate suggested that I should point out that the original intention of the Ontological Argument (found in the Monologion by St. Anselm) was not to prove the existence of God, but to explore what he's like.

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"Die Deutschen meinen, daß die Kraft sich in Härte und Grausamkeit offenbaren müsse, sie unterwerfen sich dann gerne und mit Bewunderung:[...]. Daß es Kraft giebt in der Milde und Stille, das glauben sie nicht leicht."

"The Germans believe that power must reveal itself in hardness and cruelty and then submit themselves gladly and with admiration[...]. They do not believe readily that there is power in meekness and calm."

-- Friedrich Nietzsche