I consider that I possess no senses; I imagine that body, figure, extension, motion and place are but fictions of my mind.
Cogito ergo sum
Meditations on First Philosophy, Meditation I
1641
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"I am a thinking thing, that is to say a mind, or a soul, or an understanding, or a reason."
Controversial"It is not enough to possess a good mind; one must make good use of it."
Controversial"Except our own thoughts, there is nothing absolutely in our power."
Strange & Unusual"I entirely abandoned the study of letters, resolving to seek no other science than that which could be found in myself, or at least in the great book of the world."
Shocking"To be a good philosopher, one must be a good mathematician."
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