"The existence of God is clearly demonstrated by the very idea of God."

"I think, therefore I am."

"I perceived it was possible to arrive at knowledge highly useful in life; and that, instead of the speculative philosophy usually taught in the Schools, we might find a practical, by means of which, k…"

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

"The first precept was never to accept anything for true which I did not clearly know to be such."