Cut off from one person, you're cut off from all.

The source

"Cut off from one person, you're cut off from all." Marcus Aurelius said it in Meditations 11.8. Translated from the original Greek by Spartan Surfers.

"οὕτω δὴ καὶ ἄνθρωπος ἑνὸς ἀνθρώπου ἀποσχισθεὶς ὅλης τῆς κοινωνίας ἀποπέπτωκε."

Original Greek, Meditations 11.8. 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 "Cut off from one person, you're cut off from all."?

Marcus Aurelius (121–180 AD). Source: Meditations 11.8.

What is the original Greek?

οὕτω δὴ καὶ ἄνθρωπος ἑνὸς ἀνθρώπου ἀποσχισθεὶς ὅλης τῆς κοινωνίας ἀποπέπτωκε. Translated from the original Greek by Spartan Surfers.