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But I have convinced myself that there is absolutely nothing in the world, no sky, no earth, no minds, no bodies.
Does it now follow that I, too, do not exist?
No. If I convinced myself of something thought anything at all, then I certainly existed.
But there is a deceiver of supreme power and cunning who deliberately and constantly deceives me.
In that case, I, too, undoubtedly exist, if he deceives me ; and let him deceive me as much as he can, he will never bring it about that I am nothing, so long as I think that I am something.
So, after considering everything very thoroughly, I must finally conclude that the proposition, I am, I exist, is necessarily true whenever it is put forward by me or conceived in my mind.
( AT VII 25 ; CSM II 16 – 17 )

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