Rene Descartes — "I think, therefore I am — this is the first and most certain conclusion that any…"
I think, therefore I am — this is the first and most certain conclusion that anyone who philosophizes in order should arrive at.
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More from Rene Descartes
"I was very surprised to find that I had been mistaken more often than not in my life."
"I feel within me a will that is far more extensive than my understanding."
"I confess that I have never found in my experience that anything which I once clearly understood could afterwards be called into doubt by me."
"The nature of the mind is entirely distinct from that of the body."
"The greatest good for man is to live according to reason."