Consider that everything which happens, happens justly, and if thou observest carefully, thou wilt find it to be so. I do not say only with respect to the continuity of the series of things, but with respect to what is just, and as if it were done by one who assigns to each thing its value. Observe then as thou hast begun; and whatever thou doest, do it in conjunction with this, the being good, and in the sense in which a man is properly understood to be good. Keep to this in every action.
Do not act as if thou wert going to live ten thousand years. Death hangs over thee. While thou livest, while it is in thy power, be good.
Whatever any one does or says, I must be good, just as if the gold, or the emerald, or the purple were always saying this, Whatever any one does or says, I must be emerald and keep my colour.
In everything which happens keep before thy eyes those to whom the same things happened, and how they were vexed, and treated them as strange things, and found fault with them: and now where are they? Nowhere. Why then dost thou too choose to act in the same way? And why dost thou not leave these agitations which are foreign to nature, to those who cause them and those who are moved by them? And why art thou not altogether intent upon the right way of making use of the things which happen to thee? For then thou wilt use them well, and they will be a material for thee to work on. Only attend to thyself, and resolve to be a good man in every act which thou doest: and remember...
This is the chief thing: Be not perturbed, for all things are according to the nature of the universal; and in a little time thou wilt be nobody and nowhere, like Hadrian and Augustus. In the next place having fixed thy eyes steadily on thy business look at it, and at the same time remembering that it is thy duty to be a good man, and what man's nature demands, do that without turning aside; and speak as it seems to thee most just, only let it be with a good disposition and with modesty and without hypocrisy.
Thou sufferest this justly: for thou choosest rather to become good to-morrow than to be good to-day.
What is thy art? To be good. And how is this accomplished well except by general principles, some about the nature of the universe, and others about the proper constitution of man?