"To be good is noble, but to teach others how to be good is nobler and no trouble."

"The very first thing which a man has to do, in order to learn how to do a thing, is to learn how to unlearn it."

"I believe that the only way to get a man to do a thing is to make him believe that he is doing it of his own free will."

"I did not attend his funeral, but I sent a nice letter saying I approved of it."

"Why shouldn't I be an optimist? I have nothing to lose."