This is the true source of moral evil. It is thus that every thing conspires to render man vicious, and give a fatal impulse to his soul: from whence results the general confusion of society, which becomes unhappy, from the misery of almost every one of its members. The strongest motive-powers are put in action to inspire man with a passion for futile objects which are indifferent to him; which make him become dangerous to his fellow man, by the means which he is compelled to employ, in order to obtain them. Those who have the charge of guiding his steps, either impostors themselves, or the dupes to their own prejudices, forbid him to hearken to reason; they make truth appear dangerous to him; they exhibit error as requisite to his welfare, not only in this world, but in the next. In short, habit strongly attaches him to his irrational opinions, to his perilous inclinations, and to his blind passion for objects either useless or dangerous. Here, then, is the reason why for the most part man finds himself necessarily determined to evil; the reason why the passions, inherent in his Nature and necessary to his conservation, become the instruments of his destruction, and the bane of that society, which properly conducted, they ought to preserve; the reason why society becomes a state of warfare; why it does nothing but assemble enemies, who are envious of each other, and are always rivals for the prize. If some virtuous beings are to be found in these societies, they must be sought for in the very small number of those, who born with a phlegmatic temperament have moderate passions, who therefore, either do not desire at all, or desire very feebly, those objects with which their associates are continually inebriated. Man's nature, diversely cultivated, decides upon his faculties, as well corporeal as intellectual; upon his qualities, as well moral as physical. The man who is of a sanguine, robust constitution, must necessarily have strong passions; he who is of a bilious, melancholy habit, will as necessarily have fantastical and gloomy passions; the man of a gay turn, of a sprightly imagination, will have cheerful passions; while the man in whom phlegm abounds, will have those which are gentle, or which have a very slight degree of violence. It appears to be upon the equilibrium of the humours, that depends the state of the man who is called _virtuous_; his temperament seems to be the result of a combination, in which the elements or principles are balanced with such precision that no one passion predominates over another, or carries into his machine more disorder than its neighbour.