Marcus Aurelius
Meditations 6.49
Thou art not dissatisfied. I suppose, because thou weighest only so many litrae and not three hundred. Be not dissatisfied then that thou must live only so many years and not more; for as thou art satisfied with the amount of substance which has been assigned to thee, so be content with the time.
Marcus Aurelius, Meditations 6.49, translated by George Long
Thou art not aggrieved, art thou, at being so many pounds in weight and not three hundred? Then why be aggrieved if thou hast only so many years to live and no more? For as thou art contented with the amount of matter allotted thee, so be content also with the time.
Marcus Aurelius, Meditations 6.49, translated by C. R. Haines