In vain should we attempt to cure men of their vices, unless we begin by curing them of their prejudices. It is only by showing them the truth, that they will perceive their true interests, and the real motives that ought to incline them to do good. Instructors have long enough fixed men's eyes upon heaven; let them now turn them upon earth. An incomprehensible theology, ridiculous fables, impenetrable mysteries, puerile ceremonies, are to be no longer endured. Let the human mind apply itself to what is natural, to intelligible objects, truth, and useful knowledge. Does it not suffice to annihilate religious prejudice, to shew, that what is inconceivable to man, cannot be good for him? Does it require any thing, but plain common sense, to perceive, that a being, incompatible with the most evident notions--that a cause continually opposed to the effects which we attribute to it--that a being, of whom we can say nothing, without falling into contradiction--that a being, who, far from explaining the enigmas of the universe, only makes them more inexplicable--that a being, whom for so many ages men have vainly addressed to obtain their happiness, and the end of sufferings--does it require, I say, any thing but plain, common sense, to perceive--that the idea of such a being is an idea without model, and that he himself is merely a phantom of the imagination? Is any thing necessary but common sense to perceive, at least, that it is folly and madness for men to hate and damn one another about unintelligible opinions concerning a being of this kind? In short, does not every thing prove, that Morality and Virtue are totally incompatible with the notions of a God, whom his ministers and interpreters have described, in every country, as the most capricious, unjust, and cruel of tyrants, whose pretended will, however, must serve as law and rule the inhabitants of the earth? To discover the true principles of Morality, men have no need of theology, of revelation, or of gods: They have need only of common sense. They have only to commune with themselves, to reflect upon their own nature, to consider the objects of society, and of the individuals, who compose it; and they will easily perceive, that virtue is advantageous, and vice disadvantageous to themselves. Let us persuade men to be just, beneficent, moderate, sociable; not because such conduct is demanded by the gods, but, because it is pleasant to men. Let us advise them to abstain from vice and crime; not because they will be punished in another world, but because they will suffer for it in this.--_These are,_ says Montesquieu, _means to prevent crimes--these are punishments; these reform manners--these are good examples._