"The only way in which a human being can make some approach to knowing the whole of a subject, is by hearing what can be said about it by persons of every variety of opinion, and studying all modes in …"

"The whole of mankind has a right to the benefit of the best ideas, which can only be produced by freedom of thought."

"The strongest argument for representative government is, that it is a security for good government."

"The only security against error is in the discussion of every subject, and the careful examination of all arguments, by which it can be supported or opposed."

"The greatest dangers to liberty lurk in insidious encroachment by men of zeal, well-meaning but without understanding."