Well you can't argue with "logic" like this. Or can you?

I remember studying Descartes in high school and being extremely excited about the simple statement that we can know nothing other than "I think, therefore I am."

However in the next chapter Descartes completely undermined the brilliance of his argument, by succumbing to his own weakness and need to believe.

Descartes seemed unable, or unwilling, to recognize that the concept of a perfect God was not born out of whole cloth, but rather an evolving perception that went through multiple stages before settling on what for him was an undeniable truth.

I think that was the first time that I was completely aware of how dangerous self deception could be even to those with a powerful intellect.