"The world is a great book, of which we have only read the first page."

"It is not by the force of reason that we have adopted religion, but by the force of habit."

"To be a man is to be an object of scorn to the angels, and of envy to the devils."

"The only difference between a madman and me is that I am not mad."

"We know the truth, not only by reason, but also by the heart."