It is for want of having felt that an intelligent being cannot for an instant lose sight of his own peculiar conservation--of his particular interests, either real or fictitious--of his own welfare, whether permanent or transitory; in short, of his happiness, either true or false. It is for want of having considered that desires are natural, that passions are essential, that both the one and the other are motions necessary to the soul of man,--that the physicians of the, human mind have supposed supernatural causes for his wanderings; have only applied to his evils topical remedies, either useless or dangerous. Indeed, in desiring him to stifle his desires, to combat his propensities, to annihilate his passions, they have done no more than give him sterile precepts, at once vague and impracticable; these vain lessons have influenced no one; they have at most restrained some few mortals whom a quiet imagination but feebly solicited to evil; the terrors with which they have accompanied them have disturbed the tranquillity of those persons who were moderate by their nature, without ever arresting the ungovernable temperament of those who were inebriated by their passions, or hurried along; by the torrent of habit. In short, the promises of superstition, as well as the menaces it holds forth, have only formed fanatics, given birth to enthusiasts, who are either dangerous or useless to society, without ever making man truly virtuous; that is to say, useful to his fellow creatures. These, empirics guided by a blind routine have, not seen that man as long as he exists, is obliged to feel, to desire, to have passions, to satisfy them in proportion to the energy which his organization has given him; they have not perceived that education planted these desires in his heart--that habit rooted them--that his government, frequently vicious, corroborated their growth--that public opinion stamped them with its approbation--that--experience render them necessary--that to tell men thus constituted to destroy their passions, was either to plunge them into despair or else to order them remedies too revolting for their temperament. In the actual state of opulent societies, to say to a man who knows by experience that riches procure every pleasure, that he must not desire them; that he must not make any efforts to obtain them; that he ought to detach himself from them: is to persuade him to render himself miserable. To tell an ambitious man not to desire grandeur, not to covet power, which every thing conspires to point out to him as the height of felicity, is to order him to overturn at one blow the habitual system of his ideas; it is to speak, to a deaf man. To tell a lover of an impetuous temperament to stifle his passions for the object that enchants him, is to make him understand, that he ought to renounce his happiness. To oppose superstition to such substantive, such puissant interests is to combat realities by chimerical speculations.