"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 …"

"I consider that I possess no senses; I imagine that body, figure, extension, motion and place are but fictions of my mind."

"I desire to live, and to continue the studies I have begun, but I have not found anyone who could tell me where to go."

"The reading of all good books is like a conversation with the finest minds of past centuries."

"I hope that posterity will judge me kindly, not only as to the things which I have explained, but also as to those which I have intentionally omitted so as to leave to others the pleasure of discovery…"