Plutarch, Moralia 232 D – 236 E:

16.
One of the Spartans saw Diogenes the Cynic holding his arms around a bronze statue in very cold weather, and asked Diogenes if he were cold; and when Diogenes said “No”, the other said, “What great thing are you doing then? [τί οὖν, ἔφη, μέγα ποιεῖς;]” (1)

18.
A man who was visiting Sparta stood for a long time upon one foot, and said to a Spartan, “I do not think that you, sir [ὦ Λάκων], could stand upon one foot as long as that”, and the other interrupting said, “No, but there is not a single goose that could not do it [οὐ γάρ, ἔφη, τῶν μέντοι χηνῶν οὐκ ἔστιν ὅστις οὔ].”

22.
One of the men serving in the army of Lysimachus (2), being asked by him whether he were not one of the Helots, said, “Do you suppose that any Spartan would come to get the sixpence which you pay? [σὺ δ’ οἴει, ἔφη, ἐπὶ τὸ παρὰ σοῦ τετρώβολον Λάκωνα ἥξειν;]”

24.
At the time when the Athenians had surrendered their city (3), they declared it was only right that Samos should be left to them, but the Spartans said, “Do you, at a time when you do not even own yourselves, seek to possess others?” From this incident arose the proverb: “Who does not own himself would Samos own [ὃς αὐτὸς αὑτὸν οὐκ ἔχει Σάμον θέλει].”

[Plutarch: Moralia III. Ed. by Frank Cole Babbitt. Cambridge (Mass.)/London ⁷2004, pp. 394-421]

(1) Diogenes trainierte auf diese Weise seine Unempfindlichkeit gegen Kälte, wie er sich im Sommer im heißen Sand wälzte.
(2) Lysimachos: General Alexanders, Diadoche
(3) 404 v.u.Z. im Peloponnesischen Krieg