Rene Descartes — "The mind is a substance whose whole essence or nature consists only of thinking."
The mind is a substance whose whole essence or nature consists only of thinking.
The mind is a substance whose whole essence or nature consists only of thinking.
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"I am certain that I am a thinking thing, and that I have a body, and that I am distinct from my body."
"I have never found anything in the works of the ancient philosophers that compares to the certainty I have found in mathematics."
"The will is by its nature so free that it can never be constrained."
"Whenever anyone has offended me, I try to raise my soul so high that the offense cannot reach it."
"The preservation of health has always been the principal end of my studies."
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