St. Anselm's Ontological Argument

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It is important to show why the topic you are discussing is important, especially if there are other topics that could be studied in place of the one you are discussing. In this case, the discussion is on Saint Anselm and his Ontological Argument. There have been other arguments made before Saint Anselm on God's existence, and the first paragraph will show why it is important to study this particular argument. Then the argument itself is given and discussed. And just like most arguments in the field of philosophy, the Ontological Argument has an objection. This too is given and discussed.

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Saint Anselm takes a different approach than St. Thomas Aquinas and William Paley when trying to prove that God exists. In St. Aquinas' Cosmological Argument and Paley's Teleogical Argument, the premises were a posteriori, meaning they could only be accepted as true after ("post") experience. You must have experienced or dealt with motion before to accept Aquinas' argument, and you must know what a watch and rock look like to accept Paley's argument. Just understanding the concept of motion, a watch, and a rock is not sufficient to accept the arguments. However, St. Anselm's argument does not require that you experience things. It only requires a priori beliefs, meaning if you understand a proposition then you can believe it is true. Just as the term suggests, a priori propositions "are knowable prior to, or independently of, experience" (82).

Another way that St. Anselm's argument differs from other arguments is that it requires that you look at a definition of the concept of God. As Sober says, the definition of an object does not, in itself, prove its existence. Some examples he gives are unicorns and golden...

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...selm replies saying that Gaunilo is wrong because by definition an island is a finite object that cannot contain infinite properties. But the definition of God is a being that can contain infinite properties.

Many philosophers, including Elliott Sober, have criticized Anselm for his reply to Gaunilo, as well as Gaunilo's attempt to show the Ontological Argument is not deductively valid. Gaunilo says that there must be something wrong with the argument, but he does not point out where the mistake is. It is necessary to do so because Anselm's argument does look valid. Indeed, Anselm says that the Ontological Argument is deductively valid because of the difference between God and an island. "This seems implausible, since deductive validity doesn't depend on an argument's subject matter, only on its form, and the two arguments have the same logical form" (87).

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