"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."
Philosopher
"I think, therefore I am."
"The reading of all good books is like a conversation with the finest minds of past centuries."
"Mathematics is a more powerful instrument of knowledge than any other that has been bequeathed to us by human agency."
"Divide each difficulty into as many parts as is feasible and necessary to resolve it."
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