Rene Descartes — "I think, therefore I am, is the first and most certain truth that occurs to anyo…"
I think, therefore I am, is the first and most certain truth that occurs to anyone who philosophizes in an orderly way.
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More from Rene Descartes
"I have never had any experience that was not accompanied by some thought."
"I concluded that I was a substance whose whole essence or nature consists only in thinking, and that, in order to exist, it needs no place and depends on no material thing."
"The greatest minds are capable of the greatest vices as well as of the greatest virtues."
"Our knowledge of the external world is derived from our senses, and our senses are often unreliable."
"I have never found anything in the works of the ancient philosophers that compares to the certainty I have found in mathematics."