What is the original Greek?

Οὐδεὶς κάμνει ὠφελούμενος ... μὴ οὖν κάμνε ὠφελούμενος, ἐν ᾧ ὠφελεῖς. Translated from the original Greek by Spartan Surfers.

Nobody gets tired of being helped. Don't get tired of helping.

Marcus Aurelius, Meditations 7.74

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The source

"Nobody gets tired of being helped. Don't get tired of helping." Marcus Aurelius said it in Meditations 7.74. Translated from the original Greek by Spartan Surfers.

"Οὐδεὶς κάμνει ὠφελούμενος ... μὴ οὖν κάμνε ὠφελούμενος, ἐν ᾧ ὠφελεῖς."

Original Greek, Meditations 7.74. Greek: Leopold 1908 (Teubner) via Perseus.

Who said it

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

Questions

Who said "Nobody gets tired of being helped. Don't get tired of helping."?: Marcus Aurelius (121–180 AD). Source: Meditations 7.74.
What is the original Greek?: Οὐδεὶς κάμνει ὠφελούμενος ... μὴ οὖν κάμνε ὠφελούμενος, ἐν ᾧ ὠφελεῖς. Translated from the original Greek by Spartan Surfers.