Rene Descartes — "I have never found anything in the works of the ancient philosophers that compar…"
I have never found anything in the works of the ancient philosophers that compares to the certainty I have found in mathematics.
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More from Rene Descartes
"I am accustomed to take my sleep for granted, and I often imagine that I dream of the most important things, when after all I am only dreaming."
"I am a thing that thinks, that doubts, that affirms, that denies, that wills, that refuses, that imagines also, and that perceives."
"I confess that I have never been able to find out what is the 'substantial form' of a human body, or how it differs from the form of a statue."
"I think, therefore I am a doubt."
"I suppose therefore that all I see is false. I believe that none of what my deceptive memory represents to me ever existed."