“But why do some people support [the heretics]?" "Because it serves their purposes, which concern the faith rarely, and more often the conquest of power." "Is that why the church of Rome accuses all its adversaries of heresy?" "That is why, and that is also why it recognizes as orthodoxy any heresy it can bring back under its own control or must accept because the heresy has become too strong.”

“The world is kept alive only by heretics: the heretic Christ, the heretic Copernicus, the heretic Tolstoy. Our symbol of faith is heresy. (“Tomorrow”)”

“If we have no heretics we must invent them, for heresy is essential to health and growth.”

“There is no heresy or no philosophy which is so abhorrent to the church as a human being.”

“The faith a movement proclaims doesn't count: what counts is the hope it offers. All heresies are the banner of a reality, an exclusion. Scratch the heresy and you will find the leper. Every battle against heresy wants only this: to keep the leper as he is.”

“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.”