DESCARTES: Cogito Ergo Sum

I have convinced myself that there is nothing in the world — no sky, no earth, no minds, no bodies. Doesn’t it follow that I don’t exist? No, surely I must exist if it’s me who is convinced of something. But there is a deceiver, supremely powerful and cunning whose aim is to see that I am always deceived. But surely I exist, if I am deceived. Let him deceive me all he can, he will never make it the case that I am nothing while I think that I am something. Thus having fully weighed every consideration, I must finally conclude that the statement “I am, therefore I exist” must be true whenever I state it or mentally consider it.
                                                                                   — Descartes, Meditations II

http://en.wikipedia.org/wiki/Cogito_ergo_sum

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