Meditations 2.14

Though thou shouldest be going to live three thousand years and as many times ten thousand years, still remember that no man loses any other life than this which he now lives, nor lives any other than this which he now loses. The longest and shortest are thus brought to the same. For the present is the same to all, though that which perish is not the same; and so that which is lost appears to be a mere moment. For a man cannot lose either the past or the future: for what a man has not, how can any one take this from him? These two things then thou must bear in mind; the one, that all things from eternity are of like forms and come round in a circle, and that it makes no difference whether a man shall see the same things during a hundred years, or two hundred, or an infinite time; and the second, that the longest liver and he who will die soonest lose just the same. For the present is the only thing of which a man can be deprived, if it is true that this is the only thing which he has, and that a man cannot lose a thing if he has it not.

Marcus Aurelius, Meditations 2.14, translated by George Long

Even if thy life is to last three thousand years or for the matter of that thirty thousand, yet bear in mind that no one ever parts with any other life than the one he is now living, nor lives any other than that which he now parts with. The longest life, then, and the shortest amount but to the same. For the present time is of equal duration for all, while that which we lose is not ours; and consequently what is parted with is obviously a mere moment. No man can part with either the past or the future. For how can a man be deprived of what he does not possess? These two things, then, must needs be remembered: the one, that all things from time everlasting have been cast in the same mould and repeated cycle after cycle, and so it makes no difference whether a man see the same things recur through a hundred years or two hundred, or through eternity: the other, that the longest liver and he whose time to die comes soonest part with no more the one than the other. For it is but the present that a man can be deprived of, if, as is the fact, it is this alone that he has, and what he has not a man cannot part with.

Marcus Aurelius, Meditations 2.14, translated by C. R. Haines