“The individual's duty is to do what he wants to do, to think whatever he likes, to be accountable to no one but himself, to challenge every idea and every person.”

“Happiness is not fame or riches or heroic virtues, but a state that will inspire posterity to think in reflecting upon our life, that it was the life they would wish to live.”

“The holy word of God is on everyone's lips...but...we see almost everyone presenting their own versions of God's word, with the sole purpose of using religion as a pretext for making others think as they do.”

“People thinking for themselves have more energy in their voice, than any government, which it is possible for human wisdom to invent; and every government not aware of this sacred truth will, at some period, be suddenly overturned.”

“Time is made up of various ages; and each thinks its own a novelty.”

“The propagandist's purpose is to make one set of people forget that certain other sets of people are human.”

“If an opinion contrary to your own makes you angry, that is a sign that you are subconsciously aware of having no good reason for thinking as you do.”