Plato, Laws 628d

αὑτὴν πόλιν οὐκ ἦν τῶν ἀρίστων ἀλλὰ τῶν ἀναγκαίων· ὅμοιον ὡς εἰ κάμνον σῶμα ἰατρικῆς καθάρσεως τυχὸν ἡγοῖτό τις ἄριστα πράττειν τότε, τῷ δὲ μηδὲ τὸ παράπαν δεηθέντι σώματι μηδὲ προσέχοι τὸν νοῦν, ὡσαύτως δὲ καὶ πρὸς πόλεως εὐδαιμονίαν ἢ καὶ ἰδιώτου διανοούμενος οὕτω τις οὔτʼ ἄν ποτε πολιτικὸς γένοιτο ὀρθῶς, πρὸς τὰ ἔξωθεν πολεμικὰ ἀποβλέπων μόνον καὶ πρῶτον, οὔτʼ ἂν νομοθέτης ἀκριβής, εἰ μὴ χάριν εἰρήνης τὰ πολέμου νομοθετοῖ μᾶλλον

we mentioned of a State over itself is not one of the best things but one of those which are necessary. For imagine a man supposing that a human body was best off when it was sick and aged with physic, while never giving a thought to the case of the body that needs no physic at all! Similarly, with regard to the well-being of a State or an individual, that man will never make genuine statesman who pays attention primarily solely to the needs of foreign warfare, nor will he make a finished lawgiver unless he designs his legislation for peace