Laudator Temporis Acti

Dionysius of Halicarnassus, Roman Antiquities 8.83.2 (tr. Earnest Cary):

Now in all nations and places, both Greek and barbarian, respites from evils from abroad are wont to provoke civil and domestic wars; and this happens especially among those peoples who choose a life of warfare and its hardships from a passion for liberty and dominion. For natures which have learned to covet more than they have find it difficult, when restrained from their usual employments, to remain patient, and for this reason the wisest leaders are always stirring up the embers of some foreign quarrels in the belief that wars waged abroad are better than those fought at home.

ἐν ἅπασι μὲν οὖν ἔθνεσι καὶ τόποις Ἑλλήνων τε καὶ βαρβάρων φιλοῦσιν αἱ τῶν ἔξωθεν κακῶν ἀνάπαυλαι ἐμφυλίους τε καὶ ἐνδήμους ἐγείρειν πολέμους, μάλιστα δὲ τοῦτο πάσχουσιν ὅσοι πολεμιστὴν καὶ κακόπαθον αἱροῦνται βίον ἐλευθερίας τε καὶ ἡγεμονίας πόθῳ. χαλεπαὶ γὰρ αἱ μαθοῦσαι τοῦ πλείονος ἐφίεσθαι φύσεις ἐξειργόμεναι τῶν συνήθων ἔργων καρτερεῖν· καὶ διὰ τοῦτο οἱ φρονιμώτατοι τῶν ἡγεμόνων ἀεί τινας ἐκ τῶν ἀλλοεθνῶν ἀναζωπυροῦσιν ἔχθρας, κρείττονας ἡγούμενοι τῶν ἐντοπίων πολέμων τοὺς ἀλλοδαπούς.