"It is not enough to possess a good mind; one must make good use of it."

"I suppose therefore that all the things I see are false imaginations; I believe that nothing ever existed of all that my fallacious memory represents to me."

"I know that I am a thinking thing, and that I have an idea of God."

"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 …"

"The light of natural reason is sufficient to distinguish the true from the false."