Ontological argument

===Thomas Aquinas===
[[Thomas Aquinas]], while proposing [[Quinque viae|five proofs]] of God's existence in his ''[[Summa Theologica]]'', objected to Anselm's argument. He suggested that people cannot know the nature of God and, therefore, cannot conceive of God in the way Anselm proposed.<ref>{{cite book | title=Ontological Arguments and Belief in God | publisher=Cambridge University Press | author=Oppy, Graham | year=2007 | pages=122–123 | isbn=978-0-521-03900-0 | url=https://books.google.com/books?id=qg0spmMuC98C&q=ontological+argument+thomas+aquinas&pg=PA122}}</ref> The ontological argument would be meaningful only to someone who understands the essence of God completely. Aquinas reasoned that, as only God can completely know His essence, only He could use the argument.<ref>{{Cite web |title=SUMMA THEOLOGIAE: The existence of God (Prima Pars, Q. 2) |url=https://www.newadvent.org/summa/1002.htm |access-date=2023-11-17 |website=www.newadvent.org}}</ref> His rejection of the ontological argument led other Catholic theologians to also reject the argument.<ref>{{cite encyclopedia |title=The Existence of God |encyclopedia=The Catholic Encyclopedia |url=http://www.newadvent.org/cathen/06608b.htm#IBf |access-date=2007-01-19 |last=Toner |first=P. J.}}</ref>