Who said "Don't carry your whole life at once. Just this part."?

Marcus Aurelius (121–180 AD). Source: Meditations 8.36.

What is the original wording?

Do not disturb thyself by thinking of the whole of thy life (George Long, 1862). Translated by George Long, 1862.

"Don't carry your whole life at once. Just this part." Marcus Aurelius said it in Meditations 8.36. Translated by George Long, 1862.

"Do not disturb thyself by thinking of the whole of thy life"

George Long, 1862, Meditations 8.36.

Marcus Aurelius (121–180 AD). Roman emperor who wrote private notes to himself on a military campaign. We know them as the Meditations.

Who said "Don't carry your whole life at once. Just this part."?: Marcus Aurelius (121–180 AD). Source: Meditations 8.36.
What is the original wording?: Do not disturb thyself by thinking of the whole of thy life (George Long, 1862). Translated by George Long, 1862.