Rene Descartes — "I think, therefore I am a doubt."
I think, therefore I am a doubt.
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More from Rene Descartes
"It is true that when I consider how many different beliefs there are among men, I find no reason to choose one rather than another."
"The first precept was never to accept anything for true which I did not clearly know to be such."
"I have never found anything in the works of the ancient philosophers that compares to the certainty I have found in mathematics."
"I resolved to seek no other knowledge than that which I might find within myself, or in the great book of the world."
"The existence of God is as certain as any geometrical demonstration."