It is proper to a philosopher to doubt everything, at least once.
Cogito ergo sum
Principles of Philosophy, Part I, Principle I
1644
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"It is not enough to possess a good mind; one must make good use of it."
Controversial"Travelling is almost like talking with those of other centuries."
Controversial"The mind is more easily known than the body."
Controversial"The first precept was never to accept a thing as true until I knew it as such without a single doubt."
Controversial"The long chains of simple and easy reasonings by means of which geometers are accustomed to reach the conclusions of their most difficult demonstrations, had led me to imagine that all things, to the …"
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