Body, soul, intelligence: to the body belong sensations, to the soul appetites, to the intelligence principles. To receive the impressions of forms by means of appearances belongs even to animals; to be pulled by the strings of desire belongs both to wild beasts and to men who have made themselves into women, and to a Phalaris and a Nero: and to have the intelligence that guides to the things which appear suitable belongs also to those who do not believe in the gods, and who betray their country, and do their impure deeds when they have shut the doors. If then everything else is common to all that I have mentioned, there remains that which is peculiar to the good man, to be pleased and content with what happens, and with the thread which is spun for him; and not to defile the divinity which is planted in his breast, nor disturb it by a crowd of images, but to preserve it tranquil, following it obediently as a god, neither saying anything contrary to the truth, nor doing anything contrary to justice. And if all men refuse to believe that he lives a simple, modest, and contented life, he is neither angry with any of them, nor does he deviate from the way which leads to the end of life, to which a man ought to come pure, tranquil, ready to depart, and without any compulsion perfectly reconciled to his lot.
The prime principle then in man's constitution is the social. And the second is not to yield to the persuasions of the body, for it is the peculiar office of the rational and intelligent motion to circumscribe itself, and never to be overpowered either by the motion of the senses or of the appetites, for both are animal; but the intelligent motion claims superiority and does not permit itself to be overpowered by the others. And with good reason, for it is formed by nature to use all of them. The third thing in the rational constitution is freedom from error and from deception. Let then the ruling principle holding fast to these things go straight on, and it has what is its own.