Descartes Version of the Ontological Argument

Rene Descartes (1596—1650)

Descartes ontological argument

What was Descartes Ontological Argument?

Descartes Ontological Argument uses the example of triangle to try to prove God’s existence. Descartes Ontological argument is that existence is necessary to God as 3 sides are necessary to a triangle.  In this argument, existence is a predicate. Descartes writes this argument in his Meditations on First Philosophy.

[youtube http://www.youtube.com/watch?v=G2qfgXf47QE&w=560&h=315]

What are the problems with Descartes Ontological Argument?

Kant argues against Descartes, saying that existence cannot be a predicate, because it does not add value to something. For example, when I describe my Jack Russell Terrier, I say that he is a small dog with white fur and a black spot on his back. I don’t then say ‘and he exists!’

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