Who said "Brothers of one mind are stronger than any wall."?

Antisthenes (c. 446–366 BC). Source: Diogenes Laertius 6.6.

What is the original Greek?

Ὁμονοούντων ἀδελφῶν συμβίωσιν παντὸς ἔφη τείχους ἰσχυροτέραν εἶναι. Translated from the original Greek by Spartan Surfers.

Brothers of one mind are stronger than any wall.

Antisthenes, Diogenes Laertius 6.6

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The source

"Brothers of one mind are stronger than any wall." Antisthenes said it in Diogenes Laertius 6.6. Translated from the original Greek by Spartan Surfers.

"Ὁμονοούντων ἀδελφῶν συμβίωσιν παντὸς ἔφη τείχους ἰσχυροτέραν εἶναι."

Original Greek, Diogenes Laertius 6.6. Greek: Hicks 1925 Loeb text via Perseus.

Who said it

Antisthenes (c. 446–366 BC). Student of Socrates and forerunner of the Cynics.

Questions

Who said "Brothers of one mind are stronger than any wall."?: Antisthenes (c. 446–366 BC). Source: Diogenes Laertius 6.6.
What is the original Greek?: Ὁμονοούντων ἀδελφῶν συμβίωσιν παντὸς ἔφη τείχους ἰσχυροτέραν εἶναι. Translated from the original Greek by Spartan Surfers.