"The greatest triumphs of propaganda have been accomplished, not by doing something, but by refraining from doing. Great is truth, but still greater, from a practical point of view, is silence about tr…"

"There are things known and there are things unknown, and in between are the doors of perception."

"Children are not to be taught by force and harshness, but by directing them to what amuses their minds so that you may be better able to discover with accuracy the peculiar bent of the genius of each."

"I am a kind of human tapeworm."

"That men do not learn very much from the lessons of history is the most important of all the lessons that history has to teach."