Marcus Aurelius
Meditations 12.23
Any one activity, whatever it may be, when it has ceased at its proper time, suffers no evil because it has ceased; nor he who has done this act, does he suffer any evil for this reason, that the act has ceased. In like manner then the whole, which consists of all the acts, which is our life, if it cease at its proper time, suffers no evil for this reason, that it has ceased; nor he who has terminated this series at the proper time, has he been ill dealt with. But the proper time and the limit nature fixes, sometimes as in old age the peculiar nature of man, but always the universal nature, by the change of whose parts the whole universe continues ever young and perfect. And everything which is useful to the universal is always good and in season. Therefore the termination of life for every man is no evil, because neither is it shameful, since it is both independent of the will and not opposed to the general interest, but it is good, since it is seasonable, and profitable to and congruent with the universal. For thus too he is moved by the Deity who is moved in the same manner with the Deity, and moved towards the same thing in his mind.
Marcus Aurelius, Meditations 12.23, translated by George Long
Any single form of activity, be it what it may, ceasing in its own due season, suffers no ill because it hath ceased, nor does the agent suffer in that it hath ceased to act. Similarly then if life, that sum total of all our acts, cease in its own good time, it suffers no ill from this very fact, nor is he in an ill plight who has brought this chain of acts to an end in its own due time. The due season and the terminus are fixed by Nature, at times even by our individual nature, as when in old age, but in any case by the Universal Nature, the constant change of whose parts keeps the whole Universe ever youthful and in its prime. All that is advantageous to the Whole is ever fair and in its bloom. The ending of life then is not only no evil to the individual—for it brings him no disgrace, if in fact it be both outside our choice and not inimical to the general weal—but a good, since it is timely for the Universe, bears its share in it and is borne along with it. For then is he, who is borne along on the same path as God, and borne in his judgment towards the same things, indeed a man god-borne.
Marcus Aurelius, Meditations 12.23, translated by C. R. Haines