Where two principles really do meet which cannot be reconciled with one another, then each man declares the other a fool and a heretic.

— Ludwig Wittgenstein

Even a child could see the division between what the Galileans [I.E., Christians] say they believe and what, in fact, they do believe, as demonstrated by their actions. A religion of brotherhood and mildness which daily murders those who disagree with its doctrines can only be thought hypocrite, or worse.

— Gore Vidal

I think all the heretics I have known have been virtuous men. They have the virtue of fortitude, or they would not venture to own their heresy; and they cannot afford to be deficient in any of the other virtues, as they would give advantage to their many enemies; and they have not, like orthodox sinners, such a number of friends to excuse or justify them.

— Benjamin Franklin

Without self-knowledge you have no root in yourselves personally; you may endure for a time, but under affliction or persecution your faith will not last. This is why many in this age (and in every age) become infidels, heretics, schismatics, disloyal despisers of the Church. They cast off the form of truth, because it never has been to them more than a form. They endure not, because they never have tasted that the Lord is gracious; and they never have had experience of His power and love, because they have never known their own weakness and need.

— John Henry Newman

All the heroes of tomorrow are the heretics of today.

— E.Y. Harburg

It comes from history. It comes from the record of the Inquisition, persecuting heretics and torturing Jews and all that sort of stuff; and it comes from the other side, too, from the Protestants burning the Catholics. It comes from the insensate pursuit of innocent and crazy old women, and from the Puritans in America burning and hanging the witches — and it comes not only from the Christian church but also from the Taliban. Every single religion that has a monotheistic god ends up by persecuting other people and killing them because they don't accept him. Wherever you look in history, you find that. It’s still going on.

— Philip Pullman

The case of the general talk of 'progress' is, indeed, an extreme one. As enunciated today, 'progress' is simply a comparative of which we have not settled the superlative. We meet every ideal of religion, patriotism, beauty, or brute pleasure with the alternative ideal of progress—that is to say, we meet every proposal of getting something that we know about, with an alternative proposal of getting a great deal more of nobody knows what.

— G.K. Chesterton

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

— Yevgeny Zamyatin

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

— Yevgeny Zamyatin

Heretics are the only [bitter] remedy against the entropy of human thought.('Literature, Revolution, and Entropy').

— Yevgeny Zamyatin