Rene Descartes — "It is not enough to know, one must also apply; it is not enough to wish, one mus…"

"I concluded that I was a substance whose whole essence or nature consists in thinking, and whose being does not depend on any place or any material thing."

"The greatest good is to live according to the dictates of right reason."

"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…"

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

"I have always held that the two questions, God and the Soul, were the chief of those which ought to be demonstrated by the help of philosophy rather than of theology."