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 have never made any discoveries that were not based on the certainty of mathematics."
Shocking"To be able to live without fear, without anxiety, without sadness, and without any other passion which could disturb the tranquillity of the soul."
Shocking"The first precept was never to accept a thing as true until I knew it as such without a single doubt."
Controversial"I have long ago observed that in order to study the truth, it is necessary once in the course of our life to demolish everything completely and start again from the foundations."
Shocking"The existence of God is demonstrated by the fact that I have an idea of a perfect being."
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