Rene Descartes — "I think, therefore I am."
I think, therefore I am.
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More from Rene Descartes
"I am a thinking substance, that is, a mind, or soul, or intellect, or reason."
"The light of natural reason is not less certain than that of revelation."
"I had rather be dead than live without philosophy."
"The nature of the mind is entirely distinct from that of the body."
"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."