“If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.”
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I am accustomed to sleep and in my dreams to imagine the same things that lunatics imagine when awake.
Rene Descartes 
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Common sense is the most fairly distributed thing in the world, for each one thinks he is so well-endowed with it that even those who are hardest to satisfy in all other matters are not in the habit of desiring more of it than they already have.
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If you would be a real seeker after truth, it is necessary that at least once in your life you doubt, as far as possible, all things.
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Divide each difficulty into as many parts as is feasible and necessary to resolve it.
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