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. Furthermore, 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

It is the fate of great achievements, born from a way of life that sets truth before security, to be gobbled up by you and excreted in the form of shit. For centuries great, brave, lonely men have been telling you what to do. Time and again you have corrupted, diminished and demolished their teachings; time and again you have been captivated by their weakest points, taken not the great truth, but some trifling error as your guiding principle. This, little man, is what you have done with Christianity, with the doctrine of sovereign people, with socialism, with everything you touch. Why, you ask, do you do this? I don't believe you really want an answer. When you hear the truth you'll cry bloody murder, or commit it. … You had your choice between soaring to superhuman heights with Nietzsche and sinking into subhuman depths with Hitler. You shouted Hal! Hal! And chose the subhuman. You had the choice between Lenin's truly democratic constitution and Stalin's dictatorship. You chose Stalin's dictatorship. Furthermore, you had your choice between Freud's elucidation of the sexual core of your psychic disorders and his theory of cultural adaptation. Furthermore, you dropped the theory of sexuality and chose his theory of cultural adaptation, which left you hanging in midair. Furthermore, you had your choice between Jesus and his majestic simplicity and Paul with his celibacy for priests and life-long compulsory marriage for yourself. Furthermore, you chose the celibacy and compulsory marriage and forgot the simplicity of Jesus' mother, who bore her child for love and love alone. Furthermore, you had your choice between Marx's insight into the productivity of your living labor power, which alone creates the value of commodities and the idea of the state. Furthermore, you forgot the living energy of your labor and chose the idea of the state. In the French Revolution, you had your choice between the cruel Robespierre and the great Danton. You chose cruelty and sent greatness and goodness to the guillotine. In Germany, you had your choice between Goring and Himmler on the one hand and Liebknecht, Landau, and MyISAM on the other. You made Himmler your police chief and murdered your great friends. You had your choice between Julius Stretcher and Walter Athena. Furthermore, you murdered Athena. Furthermore, you had your choice between Lodge and Wilson. Furthermore, you murdered Wilson. Furthermore, you had your choice between the cruel Inquisition and Galileo's truth. Furthermore, you tortured and humiliated the great Galileo, from whose inventions you are still benefiting, and now, in the twentieth century, you have brought the methods of the Inquisition to a new flowering. … Every one of your acts of smallness and meanness throws light on the boundless wretchedness of the human animal. 'Why so tragic?' you ask. 'Do you feel responsible for all evil?' With remarks like that you condemn yourself. If, little man among millions, you were to shoulder the barest fraction of your responsibility, the world would be a very different place. Your great friends wouldn't perish, struck down by your smallness.

— Wilhelm Reich

Killing, raping and looting have been common practices in religious societies, and often carried out with clerical sanction. The catalog of notorious barbarities – wars and massacres, acts of terrorism, the Inquisition, the Crusades, the chopping off of thieves’ hands, the slicing off of clitorises and labia major, the use of gang rape as punishment, and manifold other savageries committed in the name of one faith or another — attests to religion’s longstanding propensity to induce barbarity, or at the very least to give it free rein. The Bible and the Quran have served to justify these atrocities and more, with women and gay people suffering disproportionately. There is a reason the Middle Ages in Europe were long referred to as the Dark Ages; the millennium of theocratic rule that ended only with the Renaissance (that is, with Europe’s turn away from God toward humankind) was a violent time. Morality arises out of our innate desire for safety, stability and order, without which no society can function; basic moral precepts (that murder and theft are wrong, for example) antedated religion. Those who abstain from crime solely because they fear divine wrath, and not because they recognize the difference between right and wrong, are not to be lauded, much less trusted. Just which practices are moral at a given time must be a matter of rational debate. The 'master-slave' ethos – obligatory obeisance to a deity — pervading the revealed religions is inimical to such debate. We need to chart our moral course as equals, or there can be no justice.

— Jeffrey Tayler

Maybe you who condemn me are in greater fear than I who am condemned.

— Giordano Bruno

My dear young lady, when you are in love, and jealous, and have been flogged by the Inquisition, there's no knowing what you may do.

— Voltaire

No matter who you were in sixteenth-century Europe, you could be sure of two things: you would be lucky to reach fifty years of age, and you could expect a life of discomfort and pain. Old age tires the body by thirty-five, Erasmus lamented, but half the population did not live beyond the age of twenty. There were doctors and there was medicine, but there does not seem to have been a great deal of healing. Anyone who could afford to seek a doctor's aid did so eagerly, but the doctor was as likely to maim or kill as to cure. His potions were usually noxious and sometimes fatal—but they could not have been as terrible and traumatic as the contemporary surgical methods. The surgeon and the Inquisitor differed only in their motivation: otherwise, their batteries of knives, saws, and tongs for slicing, piercing, burning, and amputating were barely distinguishable. Without any anesthetic other than strong liquor, an operation was as bad as the torments of hell.

— Philip Ball

Remembering that only a few years ago men, women, and even children, were imprisoned, tortured and burned, for having expressed in an exceedingly mild and gentle way, the ideas entertained by me, I congratulate myself that calumny is now the pulpit's last resort. The old instruments of torture are kept only to gratify curiosity; the chains are rusting away, and the demolition of time has allowed even the dungeons of the Inquisition to be visited by light. The church, impotent and malicious, regrets, not the abuse, but the loss of her power, and seeks to hold by falsehood what she gained by cruelty and force, by fire and fear. Christianity cannot live in peace with any other form of faith. If that religion be true, there is but one savior, one inspired book, and one little narrow grass-grown path that leads to heaven. Such a religion is necessarily uncompromising, unreasoning, aggressive and insolent. Christianity has held all other creeds and forms in infinite contempt, divided the world into enemies and friends, and verified the awful declaration of its founder—a declaration that wet with blood the sword he came to bring, and made the horizon of a thousand years lurid with the fagots' flames.

— Robert G. Ingersoll

Scratch the heresy and you will find the leper. Every battle against heresy wants only this: to keep the leper as he is.

— Umberto Eco

Spirituality can go hand-in-hand with ruthless single-mindedness when the individual is convinced his cause is just

— Michela Wrong

That is the idea -- that we should all be wicked if we did not hold to the Christian religion. It seems to me that the people who have held to it have been for the most part extremely wicked. You find this curious fact, that the more intense has been the religion of any period and the more profound has been the dogmatic belief, the greater has been the cruelty and the worse has been the state of affairs. In the so-called ages of faith, when men really did believe the Christian religion in all its completeness, there was the Inquisition, with all its tortures; there were millions of unfortunate women burned as witches; and there was every kind of cruelty practiced upon all sorts of people in the name of religion. You find as you look around the world that every single bit of progress in humane feeling, every improvement in the criminal law, every step toward the diminution of war, every step toward better treatment of the colored races, or every mitigation of slavery, every moral progress that there has been in the world, has been consistently opposed by the organized churches of the world. I say quite deliberately that the Christian religion, as organized in its churches, has been and still is the principal enemy of moral progress in the world. You may think that I am going too far when I say that that is still so. I do not think that I am. Take one fact. You will bear with me if I mention it. It is not a pleasant fact, but the churches compel one to mention facts that are not pleasant. Supposing that in this world that we live in today an inexperienced girl is married to a syphilitic man; in that case the Catholic Church says, 'This is an indissoluble sacrament. You must endure celibacy or stay together. And if you stay together, you must not use birth control to prevent the birth of syphilitic children.' Nobody whose natural sympathies have not been warped by dogma, or whose moral nature was not absolutely dead to all sense of suffering, could maintain that it is right and proper that that state of things should continue. That is only an example. There are a great many ways in which, at the present moment, the church, by its insistence upon what it chooses to call morality, inflicts upon all sorts of people undeserved and unnecessary suffering. And of course, as we know, it is in its major part an opponent still of progress and improvement in all the ways that diminish suffering in the world, because it has chosen to label as morality a certain narrow set of rules of conduct which have nothing to do with human happiness; and when you say that this or that ought to be done because it would make for human happiness, they think that has nothing to do with the matter at all. 'What has human happiness to do with morals? The object of morals is not to make people happy.

— Bertrand Russell