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
"The mind is a substance whose whole essence or nature consists only of thinking."
"I shall proceed by setting aside all that in which I can suppose there to be the slightest doubt, just as if I had discovered that it was wholly false."
"Cogito, ergo sum. (I think, therefore I am.)"
"To know what is true is to know what is good."
"Doubt is the origin of wisdom."