Editing Discourse on the Method (section)

=== Part IV: Proof of God and the Soul===
Applying the method to itself, [[Descartes]] challenges his own reasoning and [[reason]] itself. But Descartes believes three things are not susceptible to doubt and the three support each other to form a stable foundation for the method. He cannot doubt that something has to be there to do the doubting: ''[[I think, therefore I am]]''. The method of doubt cannot doubt reason as it is based on reason itself. By reason there exists a God, and God is the guarantor that reason is not misguided. Descartes supplies three different proofs for the existence of God, including what is now referred to as the [[ontological argument|ontological proof of the existence of God]].