History of the Peloponnesian War

Thucydides

Thucydides. Historiae, Vol 1-2. Jones, Henry Stuart, editor. Oxford: Oxford University Press, 1910. (1942 printing).

δοκεῖν οὖν σφίσι καὶ νῦν ἄμεινον εἶναι τὴν ἑαυτῶν πόλιν τεῖχος ἔχειν, καὶ ἰδίᾳ τοῖς πολίταις καὶ ἐς τοὺς πάντας ξυμμάχους ὠφελιμώτερον ἔσεσθαι·