"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 …"

"For it is not enough to have a good mind, but rather it is necessary to apply it well."

"It is precisely because I am in the habit of using my senses to think of things that I find it difficult to think of anything else."

"I would not advise anyone to read my books who has not the leisure and inclination to meditate seriously with me."

"The greatest good for man is to live according to reason."