But what is the end? What is the aim of man in the sphere he occupies? It is to preserve himself; to render his existence happy. It becomes then of the utmost importance, that he should understand the true means which reason points out, which prudence teaches him to use, in order that he may with certainty, that he may constantly arrive at the end which he proposes to himself. These he will find are his natural faculties--his mind--his talents--his industry--his actions, determined by those passions of which his nature renders him susceptible, which give more or less activity to his will. Experience and reason again shew him, that the men with whom he is associated are necessary to him, are capable of contributing to his happiness, are in a capacity to administer to his pleasures, are competent to assist him by those faculties which are peculiar to them; experience teaches him the mode he must adopt to induce them to concur in his designs, to determine them to will and incline them to act in his favour. This points out to him the actions they approve--those which displease them--the conduct which attracts them--that which repels them--the judgment by which they are swayed--the advantages that occur--the prejudicial effects that result to him from their various modes of existence and from their diverse manner of acting. This experience furnishes him with the ideas of virtue and of vice, of justice and of injustice, of goodness and of wickedness, of decency and of indecency, of probity and of knavery: In short, he learns to form a judgment of men--to estimate their actions--to distinguish the various sentiments excited in them, according to the diversity of those effects which they make him experience. It is upon the necessary diversity of these effects that is founded the discrimination between good and evil--between virtue and vice; distinctions which do not rest, as some thinkers have believed, on the conventions made between men; still less, as some metaphysicians have asserted, upon the chimerical will of supernatural beings: but upon the solid, the invariable, the eternal relations that subsist between beings of the human species congregated together, and living in society: which relations will have existence as long as man shall remain, as long as society shall continue to exist. Thus _virtue_ is every thing that is truly beneficial, every thing that is constantly useful to the individuals of the human race, living together in society; _vice_ every thing that is really prejudicial, every thing that is permanently injurious to them. The greatest virtues are those which procure for man the most durable advantages, from which he derives the most solid happiness, which preserves the greatest degree of order in his association: the greatest vices, are those which most disturb his tendency to happiness, which perpetuate error, which most interrupt the necessary order of society.