The Ontological argument

Anselm's a priori argument aims to prove the existence of God
Responding to the fool who doesn't believe in God
God is 'that than which nothing greater can be conceived'
Things can exist either in mind only or in mind and reality
It is greater to exist in mind and reality than in the mind only
God has to logically exist for the definition to be true
Guanilo: perfect island: logic doesn't work
Anselm then explains: Necessary existence is better than contingent existence
If God is that than which nothing greater can be conceived then God has necessary existence
Unlike the island which in contingent
Descartes: God possesses all perfections and existence is a quality of a perfection
E.g. a triangle has 3 sides and without one side it wouldn't be a triangle: without God existing it wouldn't be a perfect God
Kant opposes Descartes and says that existence is not a predicate
God might exist, but you can't prove it with logic
Adding 'and exists' to the end of something does not mean that it exists
Things need more than a definition to exist e.g. a unicorn can be defined but doesn't exist

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