Every nature is contented with itself when it goes on its way well; and a rational nature goes on its way well, when in its thoughts it assents to nothing false or uncertain, and when it directs its movements to social acts only, and when it confines its desires and aversions to the things which are in its power, and when it is satisfied with everything that is assigned to it by the common nature. For of this common nature every particular nature is a part, as the nature of the leaf is a part of the nature of the plant; except that in the plant the nature of the leaf is part of a nature which has not perception or reason, and is subject to be impeded; but the nature of man is part of a nature which is not subject to impediments, and is intelligent and just, since it gives to everything in equal portions and according to its worth, times, substance, cause (form), activity, and incident. But examine, not to discover that any one thing compared with any other single thing is equal in all respects, but by taking all the parts together of one thing and comparing them with all the parts together of another.
When thou risest from sleep with reluctance, remember that it is according to thy constitution and according to human nature to perform social acts, but sleeping is common also to irrational animals. But that which is according to each individual's nature is also more peculiarly its own, and more suitable to its nature, and indeed also more agreeable.
Let there be freedom from perturbations with respect to the things which come from the external cause; and let there be justice in the things done by virtue of the internal cause, that is, let there be movement and action terminating in this, in social acts, for this is according to thy nature.