Marcus Aurelius
Meditations 4.32
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 consulship, 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.
Marcus Aurelius, Meditations 4.32, translated by George Long
Think by way of illustratiou upon the times of Vespasian, and thou shalt see all these things: mankind marrying, rearing children, sickening, dying, warring, making holiday, trafficking, tilling, flattering others, vaunting themselves, suspecting, scheming, praying for the death of others, murmuring at their own lot, loving, hoarding, coveting a consulate, coveting a kingdom. Not a vestige of that life of theirs is left anywhere any longer.
Change the scene again to the times of Trajan. Again it is all the same; that life too is dead. In like manner contemplate all the other records of past time and of entire nations, and see how many after all their high-strung efforts sank down so soon in death and were resolved into the elements. But above all must thou dwell in thought upon those whom thou hast thyself known, who, following after vanity, neglected to do the things that accorded with their own constitution and, cleaving steadfastly thereto, to be content with them. And here it is essential to remember that a due sense of value and proportion should regulate the care bestowed on every action. For thus wilt thou never give over in disgust, if thou busy not thyself beyond what is right with the lesser things.
Marcus Aurelius, Meditations 4.32, translated by C. R. Haines