“The first step towards philosophy is incredulity.”
Other Denis Diderot Quotes
We are all instruments endowed with feeling and memory. Our senses are so many strings that are struck by surrounding objects and that also frequently strike themselves.
Denis Diderot 
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It is very important not to mistake hemlock for parsley, but to believe or not believe in God is not important at all.
Denis Diderot
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Man will never be free until the last king is strangled with the entrails of the last priest.
Denis Diderot
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No man has received from nature the right to command his fellow human beings.
Denis Diderot
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Gaiety is a quality of ordinary men. Genius always presupposes some disorder in the machine.
Denis Diderot
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