Such are the true causes of the corruption of morals. Ignorance and servitude are calculated to make men wicked and unhappy. Knowledge, Reason, and Liberty, can alone reform and make men happier. But every thing conspires to blind them, and to confirm their errors. Priests cheat them, tyrants corrupt and enslave them. Tyranny ever was, and ever will be, the true cause of man's depravity, and also of his calamities. Almost always fascinated by religious fiction, poor mortals turn not their eyes to the natural and obvious causes of their misery; but attribute their vices to the imperfection of their natures, and their unhappiness to the anger of the gods. They offer to heaven vows, sacrifices, and presents, to obtain the end of sufferings, which in reality, are attributable only to the negligence, ignorance, and perversity of their guides, to the folly of their customs, and above all, to the general want of knowledge. Let men's minds be filled with true ideas; let their reason be cultivated; and there will be no need of opposing to the passions, such a feeble barrier, as the fear of gods. Men will be good, when they are well instructed; and when they are despised for evil, or justly rewarded for good, which they do to their fellow citizens.
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.
The way of truth is straight; that of imposture is crooked and dark. Truth, ever necessary to man, must necessarily be felt by all upright minds; the lessons of reason are to be followed by all honest men. Men are unhappy, only because they are ignorant; they are ignorant, only because every thing conspires to prevent their being enlightened; they are wicked only because their reason is not sufficiently developed.
By what fatality then, have the first founders of all sects given to their gods ferocious characters, at which nature revolts? Can we imagine a conduct more abominable, than that which Moses tells us his God showed towards the Egyptians, where that assassin proceeds boldly to declare, in the name and by the order of his God, that Egypt shall be afflicted with the greatest calamities, that can happen to man? Of all the different ideas, which they give us of a supreme being, of a God, creator and preserver of mankind, there are none more horrible, than those of the impostors, who represented themselves as inspired by a divine spirit, and "Thus saith the Lord."
Why, O theologians! do you presume to inquire into the impenetrable mysteries of a being, whom you consider inconceivable to the human mind? You are the blasphemers, when you imagine that a being, perfect according to you, could be guilty of such cruelty towards creatures whom he has made out of nothing. Confess, your ignorance of a creating God; and cease meddling with mysteries, which are repugnant to Common Sense.