"The soul truly exists."

"The senses alone are not sufficient to give us a clear and distinct knowledge of things."

"To know what is true is to know what is good."

"Common sense is the most widely shared commodity in the world, for every man is convinced that he is well supplied with it."

"My purpose is not to teach a method which everyone ought to follow to guide his reason, but only to show how I have tried to guide mine."