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Firefly--
yes, the argument you mentioned is one version of the Ontological Argument. As you might also notice, that version can only prove "if God exists, he exists". The version I gave is a different version.
CSflim
Because in the commonly accepted semantics for explaining what 'possibly' and 'necessary' mean, 'possibly' means 'true in at least one possible world', and 'necessary' means 'true in all possible worlds'.
Moonduck
Read that post closer. The omniscient horse was only the first part of my counter-objection. The second part dealt with a horse exemplifying horse-ness.
The problem with defining things into existence other than God more generally is that most concepts do not entail existence. The argument seeks to show that the concept 'God' does entail existence. Not that it includes existence, because then the argument would be circular.
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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
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