I can easily conceive that there is nothing in the world, that there is no heaven, no earth, no minds, no bodies; is it not then likewise true that I do not exist?
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"To be possessed of a vigorous mind is not enough; the prime requisite is rightly to apply it."
"I have never found anything in the works of the ancient philosophers that compares to the certainty I have found in mathematics."
"I suppose therefore that all the things I see are false; I believe that none of those things ever existed which my fallacious memory represents to me; I consider that I possess no senses; I imagine th…"
"To be a good philosopher, one must be a good mathematician."
"I am a thinking substance, that is, a mind, or soul, or intellect, or reason."
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