Until you are conscious of your conscience, you are morally unconscious.
If a man happen to take it into his head to assassinate with his own hands, or with the sword of justice, those whom he calls heretics, that is, people who think, or perhaps only speak, differently upon a subject which neither party understands, he will be as much inclined to do this at one time as at another. Fanaticism never sleeps: it is never glutted: it is never stopped by philanthropy; for it makes a merit of trampling on philanthropy: it is never stopped by conscience; for it has pressed conscience into its service. Avarice, lust, and vengeance, have piety, benevolence, honour; fanaticism has nothing to oppose it.
Introduction to the Principles of Morals and Legislation
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If a man happen to take it into his head to assassinate with his own hands, or with the sword of justice, those whom he calls heretics, that is, people who think, or perhaps only speak, differently upon a subject which neither party understands, he will be as much inclined to do this at one time as at another. Fanaticism never sleeps: it is never glutted: it is never stopped by philanthropy; for it makes a merit of trampling on philanthropy: it is never stopped by conscience; for it has pressed conscience into its service. Avarice, lust, and vengeance, have piety, benevolence, honour; fanaticism has nothing to oppose it.
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It is often said that mankind needs a faith if the world is to be improved. In fact, unless the faith is vigilantly and regularly checked by a sense of man's fallibility, it is likely to make the world worse. From Torquemada to Robespierre and Hitler the men who have made mankind suffer the most have been inspired to do so have been inspired to do so by a strong faith; so strong that it led them to think their crimes were acts of virtue necessary to help them achieve their aim, which was to build some sort of an ideal kingdom on earth.