Plato, Laws 640b

καὶ τοῦτο οὕτως. εἰ δʼ ἦν τις μηχανὴ μηδὲν τὸ παράπαν δεδιότα μηδὲ θορυβούμενον ἐπιστῆσαι στρατοπέδῳ στρατηγόν, ἆρʼ οὐ τοῦτʼ ἂν παντὶ τρόπῳ ἐπράττομεν; σφόδρα μὲν οὖν. νῦν δέ γε οὐ στρατοπέδου περὶ λέγομεν ἄρξοντος ἐν ἀνδρῶν ὁμιλίαις ἐχθρῶν ἐχθροῖς μετὰ πολέμου, φίλων δʼ ἐν εἰρήνῃ πρὸς φίλους κοινωνησόντων φιλοφροσύνης. ὀρθῶς.

That is true, too. Now if there had existed any device for putting an army in charge of a general who was absolutely impervious to fear or perturbation, should we not have made every effort to do so? Most certainly. But what we are discussing now is not the man who is to command an army in time of war, in meetings of foe with foe, but the man who is to command friends in friendly association with friends in time of peace. Quite so.