It is then, I repeat it, only by re-conducting man to nature, that we can procure him distinct notions, evident opinions, certain knowledge; it is only by shewing him his true relations with his fellows, that we can place him on the road to happiness. The human mind, blinded by theology, has scarcely advanced a single step. Man's superstitious systems have rendered him sceptical on the most demonstrable truths. Superstition, while it pervaded every thing, while it had an universal influence, served to corrupt the whole: philosophy, dragged in its train, although it swelled its triumphant procession, was no longer any thing but an imaginary science: it quitted the real world to plunge into the sinuosities of the ideal, inconceivable labyrinths of metaphysics; it neglected nature, who spontaneously opened her book to its examination, to occupy itself with systems filled with spirits, with invisible powers, which only served to render all questions more obscure; which, the more they were probed, the more inexplicable they became; which took delight in promulgating that which no one was competent to understand. In all difficulties it introduced the Divinity; from thence things only became more and more perplexed, until nothing could be explained. Theological notions appear only to have been invented to put man's reason to flight; to confound his judgment; to deceive his mind; to overturn his clearest ideas in every science. In the hands of the theologian, logic, or the art of reasoning, was nothing more than an unintelligible jargon, calculated to support sophism, to countenance falsehood, to attempt to prove the most palpable contradictions. Morality, as we have seen, became wavering and uncertain, because it was founded on ideal systems, never in harmony with themselves, which, on the contrary, were continually contradicting their own most positive assertions. Politics, as we have elsewhere said, were cruelly perverted by the fallacious ideas given to sovereigns of their actual rights. Jurisprudence was determinately submitted to the caprices of superstition, which shackled labour, chained down human industry, controuled activity, and fettered the commerce of nations. Every thing, in short, was sacrificed to the immediate interests of these theologians: in the place of every rational science, they taught nothing but an obscure, quarrelsome metaphysics, which but too often caused the blood of those unhappy people to flow copiously who were incapable of understanding its hallucinations.