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1. I exist.
2. My existence must have a cause.
3. The only possible ultimate causes are

a) myself
b) my always having existed
c) my parents
d) something less perfect than God
e) God

4. Not a. If I had created myself, I would have made myself perfect.
5. Not b. This does not solve the problem. If I am a dependent being, I need to be continually sustained by another.
6. Not c. This leads to an infinite regress.
7. Not d. The idea of perfection that exists in me cannot have originated from a non-perfect being.
8. Therefore, e. God exists.

Descartes argued that he had a clear and distinct idea of God. In the same way that the cogito was self-evident, so too is the existence of God, as his perfect idea of a perfect being could not have been caused by anything less than a perfect being.[5]