"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, the kno…"

"The existence of God is as certain as any geometrical demonstration."

"The light of natural reason shows us that there is a God."

"I desire to live in peace and to continue the life I have begun, adopting as my motto 'to live well, one must live concealed'."

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