Consider, for example, the times of Vespasian. Thou wilt see all these things, people marrying, bringing up children, sick, dying, warring, feasting, trafficking, cultivating the ground, flattering, obstinately arrogant, suspecting, plotting, wishing for some to die, grumbling about the present, loving, heaping up treasure, desiring counsulship, kingly power. Well then, that life of these people no longer exists at all. Again, remove to the times of Trajan. Again, all is the same. Their life too is gone. In like manner view also the other epochs of time and of whole nations, and see how many after great efforts soon fell and were resolved into the elements. But chiefly thou shouldst think of those whom thou hast thyself known distracting themselves about idle things, neglecting to do what was in accordance with their proper constitution, and to hold firmly to this and to be content with it. And herein it is necessary to remember that the attention given to everything has its proper value and proportion. For thus thou wilt not be dissatisfied, if thou appliest thyself to smaller matters no further than is fit.
Neither is transpiration, as in plants, a thing to be valued, nor respiration, as in domesticated animals and wild beasts, nor the receiving of impressions by the appearances of things, nor being moved by desires as puppets by strings, nor assembling in herds, nor being nourished by food; for this is just like the act of separating and parting with the useless part of our food. What then is worth being valued? To be received with clapping of hands? No. Neither must we value the clapping of tongues, for the praise which comes from the many is a clapping of tongues. Suppose then that thou hast given up this worthless thing called fame, what remains that is worth valuing? This in my opinion, to move thyself and to restrain thyself in conformity to thy proper constitution, to which end both all employments and arts lead. For every art aims at this, that the thing which has been made should be adapted to the work for which it has been made; and both the vine-planter who looks after the vine, and the horse-breaker, and he who trains the dog, seek this end. But the education and the teaching of youth aim at something. In this then is the value of the education and the teaching. And if this is well, thou wilt not seek anything else. Wilt thou not cease to value many other things too? Then thou wilt be neither free, nor sufficient for thy own happiness, nor without passion. For of necessity thou must be envious, jealous, and suspicious of those who can take away those things, and plot against those who have that which is valued by thee. Of necessity a man must be altogether in a state of perturbation who wants any of these things; and besides, he must often find fault with the gods. But to reverence and honour thy own mind will make thee content with thyself, and in harmony with society, and in agreement with the gods, that is, praising all that they give and have ordered.
If the gods have determined about me and about the things which must happen to me, they have determined well, for it is not easy even to imagine a deity without forethought; and as to doing me harm, why should they have any desire towards that? For what advantage would result to them from this or to the whole, which is the special object of their providence? But if they have not determined about me individually, they have certainly determined about the whole at least, and the things which happen by way of sequence in this general arrangement I ought to accept with pleasure and to be content with them. But if they determine about nothing- which it is wicked to believe, or if we do believe it, let us neither sacrifice nor pray nor swear by them nor do anything else which we do as if the gods were present and lived with us- but if however the gods determine about none of the things which concern us, I am able to determine about myself, and I can inquire about that which is useful; and that is useful to every man which is conformable to his own constitution and nature. But my nature is rational and social; and my city and country, so far as I am Antoninus, is Rome, but so far as I am a man, it is the world. The things then which are useful to these cities are alone useful to me. Whatever happens to every man, this is for the interest of the universal: this might be sufficient. But further thou wilt observe this also as a general truth, if thou dost observe, that whatever is profitable to any man is profitable also to other men. But let the word profitable be taken here in the common sense as said of things of the middle kind, neither good nor bad.
Where any work can be done conformably to the reason which is common to gods and men, there we have nothing to fear: for where we are able to get profit by means of the activity which is successful and proceeds according to our constitution, there no harm is to be suspected.
Do not look around thee to discover other men's ruling principles, but look straight to this, to what nature leads thee, both the universal nature through the things which happen to thee, and thy own nature through the acts which must be done by thee. But every being ought to do that which is according to its constitution; and all other things have been constituted for the sake of rational beings, just as among irrational things the inferior for the sake of the superior, but the rational for the sake of one another.
This thing, what is it in itself, in its own constitution? What is its substance and material? And what its causal nature (or form)? And what is it doing in the world? And how long does it subsist?
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.
Take me and cast me where thou wilt; for there I shall keep my divine part tranquil, that is, content, if it can feel and act conformably to its proper constitution. Is this change of place sufficient reason why my soul should be unhappy and worse than it was, depressed, expanded, shrinking, affrighted? And what wilt thou find which is sufficient reason for this?
Thou hast endured infinite troubles through not being contented with thy ruling faculty, when it does the things which it is constituted by nature to do. But enough of this.
What is that which as to this material (our life) can be done or said in the way most conformable to reason. For whatever this may be, it is in thy power to do it or to say it, and do not make excuses that thou art hindered. Thou wilt not cease to lament till thy mind is in such a condition that, what luxury is to those who enjoy pleasure, such shall be to thee, in the matter which is subjected and presented to thee, the doing of the things which are conformable to man's constitution; for a man ought to consider as an enjoyment everything which it is in his power to do according to his own nature. And it is in his power everywhere.