Four Meditations
Consider in my mind, for example's sake, the times of Vespasian: thou shalt see but the same things: some marrying, some bringing up children, some sick, some dying, some fighting, some feasting, some merchandising, some tilling, some flattering, some boasting, some suspecting, some undermining, some wishing to die, some fretting and murmuring at their present estate, some wooing, some hoarding, some seeking after magistracies, and some after kingdoms. And is not that their age quite over, and ended? Again, consider now the times of Trajan. There likewise thou seest the very self-same things, and that age also is now over and ended. In the like manner consider other periods, both of times and of whole nations, and see how many men, after they had with all their might and main intended and prosecuted some one worldly thing or other did soon after drop away.
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Those words which once were common and ordinary, are now become obscure and obsolete; and so the names of men once commonly known and famous, are now become in a manner obscure and obsolete names. Camillus, Cieso, Volesius, Leonnatus; not long after, Scipio, Cato, then Augustus, then Adrianus, then Antoninus Pius: all these in a short time will be out of date, and, as things of another world as it were, become fabulous. And this I say of them, who once shined as the wonders of their ages, for as for the rest, no sooner are they expired, than with them all their fame and memory. And what is it then that shall always be remembered? all is vanity. What is it that we must bestow our care and diligence upon? even upon this only: that our minds and wills be just; that our actions be charitable; that our speech be never deceitful, or that our understanding be not subject to error; that our inclination be always set to embrace whatsoever shall happen unto us, as necessary, as usual, as ordinary, as flowing from such a beginning, and such a fountain, from which both thou thyself and all things are. Willingly therefore, and wholly surrender up thyself unto that fatal concatenation, yielding up thyself unto the fates, to be disposed of at their pleasure.
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When thou hast trouble in getting up, say to thyself: I awake to do the work of a man; why then should I grieve for having to do the things for which I was sent into the world? Was I born to remain warmly in bed under my covers? But it is so pleasant. Wert thou born for pleasure, then? Was it not for action, for work?
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Men seek retreats for themselves, houses in the country, sea-shores, and mountains; and thou too art wont to desire such things very much. But this is altogether a mark of the most common sort of men, for it is in thy power whenever thou shalt choose to retire into thyself. For nowhere either with more quiet or more freedom from trouble does a man retire than into his own soul, particularly when he has within him such thoughts that by looking into them he is immediately in perfect tranquility; and I affirm that tranquility is nothing else than the good ordering of the mind. Constantly then give to thyself this retreat, and renew thyself; and let thy principles be brief and fundamental, which, as soon as thou shalt recur to them, will be sufficient to cleanse the soul completely, and to send thee back free from all discontent with the things to which thou returnest. For with what art thou discontented? With the badness of men? Recall to thy mind this conclusion, that rational animals exist for one another, and that to endure is a part of justice, and that men do wrong involuntarily; and consider how many already, after mutual enmity, suspicion, hatred, and fighting, have been stretched dead, reduced to ashes; and be quiet at last.
-- Marcus Aurelius, "Meditations"