It is idle to pretend to cure mortals of their vices if we do not begin by curing them of their prejudices. It is only by showing them the truth that they can know their best interests and the real motives which will lead them to happiness. Long enough have the instructors of the people fixed their eyes on heaven; let them at last bring them back to the earth. Tired of an incomprehensible theology, of ridiculous fables, of impenetrable mysteries, of puerile ceremonies, let the human mind occupy itself with natural things, intelligible objects, sensible truths, and useful knowledge. Let the vain chimeras which beset the people be dissipated, and very soon rational opinions will fill the minds of those who were believed fated to be always in error. To annihilate religious prejudices, it would be sufficient to show that what is inconceivable to man can not be of any use to him. Does it need, then, anything but simple common sense to perceive that a being most clearly irreconcilable with the notions of mankind, that a cause continually opposed to the effects attributed to him; that a being of whom not a word can be said without falling into contradictions; that a being who, far from explaining the mysteries of the universe, only renders them more inexplicable; that a being to whom for so many centuries men addressed themselves so vainly to obtain their happiness and deliverance from their sufferings; does it need, I say, more than simple common sense to understand that the idea of such a being is an idea without model, and that he is himself evidently not a reasonable being? Does it require more than common sense to feel that there is at least delirium and frenzy in hating and tormenting each other for unintelligible opinions of a being of this kind? Finally, does it not all prove that morality and virtue are totally incompatible with the idea of a God, whose ministers and interpreters have painted him in all countries as the most fantastic, the most unjust, and the most cruel of tyrants, whose pretended wishes are to serve as rules and laws for the inhabitants of the earth? To discover the true principles of morality, men have no need of theology, of revelation, or of Gods; they need but common sense; they have only to look within themselves, to reflect upon their own nature, to consult their obvious interests, to consider the object of society and of each of the members who compose it, and they will easily understand that virtue is an advantage, and that vice is an injury to beings of their species. Let us teach men to be just, benevolent, moderate, and sociable, not because their Gods exact it, but to please men; let us tell them to abstain from vice and from crime, not because they will be punished in another world, but because they will suffer in the present world. There are, says Montesquieu, means to prevent crime, they are sufferings; to change the manners, these are good examples. Truth is simple, error is complicated,