“ The two operations of our understanding, intuition and deduction, on which alone we have said we must rely in the acquisition of knowledge. ”

“ I am indeed amazed when I consider how weak my mind is and how prone to error. ”

“ I think therefore I am. ”

“ A state is better governed which has few laws, and those laws strictly observed. ”

“ 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. ”

“ Except our own thoughts, there is nothing absolutely in our power. ”

“ Each problem that I solved became a rule, which served afterwards to solve other problems. ”

“ 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. ”

“ It is not enough to have a good mind the main thing is to use it well. ”

“ It is not enough to have a good mind the main thing is to use it well. ”