Fear is a dagger with which hypocrisy assassinates the soul.

Mental slavery is mental death, and every man who has given up his intellectual freedom is the living coffin of his dead soul.

There is in all artists a little of the vagabond.

Every creed is a rock in running water: humanity sweeps by it. Every creed cries to the universe, "Halt!" A creed is the ignorant Past bulling the enlightened Present.

Liberty is the condition of progress. Without Liberty, there remains only barbarism. Without Liberty, there can be no civilization.

The combined wisdom and genius of all mankind cannot possibly conceive of an argument against liberty of thought.

I will not attack your doctrines nor your creeds if they accord liberty to me. If they hold thought to be dangerous - if they aver that doubt is a crime, then I attack them one and all, because they enslave the minds of men.