“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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The senses deceive from time to time, and it is prudent never to trust wholly those who have deceived us even once.
I am accustomed to sleep and in my dreams to imagine the same things that lunatics imagine when awake.
When it is not in our power to follow what is true, we ought to follow what is most probable.
I hope that posterity will judge me kindly, not only as to the things which I have explained, but also to those which I have intentionally omitted so as to leave to others the pleasure of discovery.