Ontological argument

=== William L. Rowe ===
American philosopher of religion [[William L. Rowe]] notably believed that the structure of the ontological argument was such that it inherently [[Begging the question|begs the question]] of God's existence, that is to say, that one must have a presupposed belief in God's existence in order to accept the argument's conclusion. To illustrate this, Rowe devises the concept of a "unicornex," defined as a "unicorn that actually exists." Note that some possible object is a ''unicorn'', but since in fact ''no unicorns exist'', no possible object is a unicornex. Thus, in order to know that unicornexes are possible, you must know that unicornexes exist. Rowe believes that this is analogous to the ontological argument's conception of God in the formulation of the greatest conceivable being: the greatest conceivable being is an omnipotent, omnipowerful, supremely perfect, ''existing'' being. Nothing in that definition explicitly demonstrates existence, it is simply added on as a necessary philosophical quality in the same sense that the unicornex is given the quality of existence as well. Therefore, to Rowe, there is no way to know the existence of the greatest conceivable being without already knowing that he exists—the definition simply begs the question.<ref>{{Cite book |last=Davis |first=Stephen T. |url=https://www.worldcat.org/oclc/38224686 |title=God, reason and theistic proofs |date=1997 |publisher=W. B. Eerdmans |isbn=0-8028-4450-2 |location=Grand Rapids, Michigan |language=en-us |oclc=38224686}}</ref>
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