“Progress is born of doubt and inquiry. The Church never doubts, never inquires. To doubt is heresy, to inquire is to admit that you do not know—the Church does neither.”

“If the account given in Genesis is really true, ought we not, after all, to thank this serpent? He was the first schoolmaster, the first advocate of learning, the first enemy of ignorance, the first to whisper in human ears the sacred word liberty, the creator of ambition, the author of modesty, of inquiry, of doubt, of investigation, of progress and of civilization.”

“Take from the church the miraculous, the supernatural, the incomprehensible, the unreasonable, the impossible, the unknowable, the absurd, and nothing but a vacuum remains.”

“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.I attack the monsters, the phantoms of imagination that have ruled the world. I attack slavery. I ask for room -- room for the human mind.”

“Heresy is the eternal dawn, the morning star, the glittering herald of the day. Heresy is the last and best thought. It is the perpetual New World, the unknown sea, toward which the brave all sail. It is the eternal horizon of progress.Heresy extends the hospitalities of the brain to a new thought.Heresy is a cradle; orthodoxy, a coffin.”

“Not one of the orthodox ministers dare preach what he thinks if he knows a majority of his congregation think otherwise. He knows that every member of his church stands guard over his brain with a creed, like a club, in his hand. He knows that he is not expected to search after the truth, but that he is employed to defend the creed. Every pulpit is a pillory, in which stands a hired culprit, defending the justice of his own imprisonment.”

“There are in nature neither rewards nor punishments — there are consequences.”