A Priori (proof the premises and conclusion are not dependent on external evidence or experience), Analytical Proof (conclusion is proof contained in the premises) and a deductive argument(set of premises which moves toward a logical conclusion).
It created the conclution that God is real based on being able to define God on the rule of premesis. 1) God is the greatest possible thing, 2) God would be perfect only if he exists, 3)Therefore God exists.
St. Anselm- Defines God as "that than which nothing greater can be conceived." Things that are in existance are better than not existing.
Criticized by Gaunilo of Marmoutier (same time as Anselm). Argued that you can not jump from defining God to God exists. If you apply logic to an island, the perfect island you can images then it must exist in the world. This is illogical.
Plantinger Criticized Gaunilo saying that you can not compare God to an island. Islands have intrinsic maximum (you can always add things like more trees) you can not do this with God.
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