The vain bank on other people's actions. The wise, on their own.

The source

"The vain bank on other people's actions. The wise, on their own." Marcus Aurelius said it in Meditations 6.51. Translated from the original Greek by Spartan Surfers.

"Ὁ μὲν φιλόδοξος ἀλλοτρίαν ἐνέργειαν ἴδιον ἀγαθὸν ὑπολαμβάνει ... ὁ δὲ νοῦν ἔχων ἰδίαν πρᾶξιν."

Original Greek, Meditations 6.51. 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 "The vain bank on other people's actions. The wise, on their own."?

Marcus Aurelius (121–180 AD). Source: Meditations 6.51.

What is the original Greek?

Ὁ μὲν φιλόδοξος ἀλλοτρίαν ἐνέργειαν ἴδιον ἀγαθὸν ὑπολαμβάνει ... ὁ δὲ νοῦν ἔχων ἰδίαν πρᾶξιν. Translated from the original Greek by Spartan Surfers.