"If you want to know who controls you, look at who you are not allowed to criticize."

"The instruction we receive in our childhood is like the engraving on a stone, which time effaces but slowly."

"It is dangerous to be right in matters on which the established authorities are wrong."

"Every man is guilty of all the good he did not do."

"The more I read, the more I acquire, the more certain I am that I know nothing."