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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"The greatest good is to live according to the dictates of right reason."
Shocking"The reading of all good books is like a conversation with the finest minds of past centuries."
Strange & Unusual"The greatest good for man is to live according to reason."
Controversial"I think, therefore I am — this is the first and most certain conclusion that anyone who philosophizes in order should arrive at."
Shocking"I have never had any experience that was not accompanied by some thought."
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