Rene Descartes — "It is proper to a philosopher to doubt everything, at least once."
It is proper to a philosopher to doubt everything, at least once.
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More from Rene Descartes
"Our knowledge of the external world is derived from our senses, and our senses are often unreliable."
"I believe that all my dreams are illusions."
"It is not enough to know, one must also apply; it is not enough to wish, one must also do."
"The perception of the understanding is sometimes obscure and confused, while that of the will is always clear and distinct."
"I have been nourished by books, and I have found in them a great deal of good as well as a great deal of evil."