Anselm's Ontological Argument for the Existence of God Essay

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Anselm’s ontological argument was presented in chapter two of Anselm’s Proslogion. The actual argument is as follow: (1) If God exists only in understanding, then we can think of a being greater than God. (2) We can’t think of a being greater than God. (3) Therefore not the case that God only exists in the understanding. (4) Either God exists in reality or God exists in the understanding. (5) Therefore God exist in reality (conclusion). To put this argument in conclusion argument form it would look like this:
1. If P then Q
2. Not Q
3. Not P
4. R or P
5. Therefore R
This argument is in modus tollen form, so since it is modus tollen it is valid. To understand this argument, you must understand some of the main terms and axioms
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Since exiting in reality is greater than existing in the understanding, which is supported my Anselm’s ontological principle, than God MUST exist in reality. I think this argument is reasonable in the respect to what the definitions of God and greatest is accepted to be by Anslem. The definitions support the argument in this case. This argument is also valid, because of that fact that this argument takes the form of what is known as multiple modus tollen. Because this form is multiple modus tollen, it is a valid argument, since validity depends on the form of the argument. Gaunilo’s Lost Island argument is one of the earliest and famous objections to Anslem’s ontological argument. This argument is the exact same argument but instead of God in the argument, you replace it with the lost island. This argument would be: (1) If the lost island exists only in understanding, then we can think of an island greater than the lost island. (2) We can’t think of an island greater than the lost island. (3) Therefore not the case that the lost island only exists in the understanding. (4) Either that the lost island exists in reality or that the lost island exists in the understanding. (5) Therefore that the lost island exist in reality (conclusion). The only term that has to be defined here is the lost island since all the other terms were defined before. The lost island by Gaunilo’s

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