Who said "Stand firm and calm the water around you."?

Marcus Aurelius (121–180 AD). Source: Meditations 4.49.

What is the original wording?

it stands firm and tames the fury of the water around it (George Long, 1862). Translated by George Long, 1862.

"Stand firm and calm the water around you." Marcus Aurelius said it in Meditations 4.49. Translated by George Long, 1862.

"it stands firm and tames the fury of the water around it"

George Long, 1862, Meditations 4.49.

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 "Stand firm and calm the water around you."?: Marcus Aurelius (121–180 AD). Source: Meditations 4.49.
What is the original wording?: it stands firm and tames the fury of the water around it (George Long, 1862). Translated by George Long, 1862.