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[[Image:Anselm.jpg|thumbnail|right|175px|[[Anselm of Canterbury]] was the originator of the ontological argument]]

[[Image:Anselm.jpg|thumbnail|right|175px|[[Anselm of Canterbury]] was the originator of the ontological argument]]

The ontological argument uses the definition of [[God]] to prove His existence. It was originally proposed by [[Anselm of Canterbury]] and remained influential for centuries, and was later used by [[Descartes]]. Anselm's proof is as follows:

According to the Stanford Encyclopedia of Philosophy, "Ontological arguments are arguments, for the conclusion that God exists, from premises which are supposed to derive from some source other than observation of the world — e.g., from reason alone."<ref>http://plato.stanford.edu/entries/ontological-arguments/</ref> [[Anselm of Canterbury]]'s ontological argument uses the definition of [[God]] to prove His existence. Anselm's ontological argument remained influential for centuries, and was later used by [[Descartes]]. Anselm's proof is as follows:

:God is that for which no greater being is conceivable.

:God is that for which no greater being is conceivable.