Rene Descartes — "The two operations of our understanding, intuition and deduction, on which alone…"
The two operations of our understanding, intuition and deduction, on which alone we have said we must rely in the acquisition of knowledge.
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More from Rene Descartes
"I am a thinking substance, that is, a mind, or soul, or intellect, or reason."
"It is not enough to walk with great strides, it is necessary to walk in the right road."
"The mind is a substance whose whole essence or nature is to think, and which needs no place, nor depends on any material thing, in order to exist."
"The greatest good is to live without pain."
"I suppose therefore that all the things I see are false imaginations; I believe that nothing ever existed of all that my fallacious memory represents to me."