§5.109.1ΑΘ.
τὸ δ’ ἐχυρόν γε τοῖς ξυναγωνιουμένοις οὐ τὸ εὔνουν τῶν ἐπικαλεσαμένων φαίνεται, ἀλλ’ ἢν τῶν ἔργων τις δυνάμει πολὺ προύχῃ·
ATH. But the security for those who are to fight as allies is shown to lie not in the goodwill of those who call them in, but in whether one is far superior in active power.
ὃ Λακεδαιμόνιοι καὶ πλέον τι τῶν ἄλλων σκοποῦσιν (τῆς γοῦν οἰκείας παρασκευῆς ἀπιστίᾳ καὶ μετὰ ξυμμάχων πολλῶν τοῖς πέλας ἐπέρχονται), ὥστε οὐκ εἰκὸς ἐς νῆσόν γε αὐτοὺς ἡμῶν ναυκρατόρων ὄντων περαιωθῆναι.
This is what the Lacedaemonians look to even more than others (at any rate, out of distrust of their own resources, they attack their neighbors only with many allies), so that it is not likely that they will cross over to an island while we are masters of the sea.