Plutarch, Aussprüche von Spartanern (Moralia 212 B):

He had with him Xenophon the philosopher (1), who was treated with marked consideration, and he urged Xenophon to send for his sons, and bring them up in Sparta, where they would be taught the fairest of all lessons – to rule and to be ruled [ἄρχειν τε καὶ ἄρχεσθαι].

[Plutarch: Moralia III. Ed. by Frank Cole Babbitt. Cambridge (Mass.)/London ⁷2004, pp. 266 sq.]

(1) Xenophon von Athen, Schriftsteller und Historiker (ca. 430 bis nach 355 u.Z.); er sympathisierte mit Sparta.

Vgl. Plutarch, Leben des Agesilaos 20 sowie Diogenes Laertios II 51 und 54.