Plato, Laws 649c

θαρρήσομεν, τὸ δὲ τοὐναντίον ὅτι μάλιστα φοβησόμεθα. ἃ τῆς αἰδοῦς ἔλεγες, ὡς οἰόμεθα. καλῶς μνημονεύετε. ἐπειδὴ δὲ τήν τε ἀνδρείαν καὶ τὴν ἀφοβίαν ἐν τοῖς φόβοις δεῖ καταμελετᾶσθαι, σκεπτέον ἆρα τὸ ἐναντίον ἐν τοῖς ἐναντίοις θεραπεύεσθαι δέον ἂν εἴη. τό γʼ οὖν εἰκός. ἃ παθόντες ἄρα πεφύκαμεν διαφερόντως θαρραλέοι τʼ εἶναι καὶ θρασεῖς, ἐν τούτοις δέον ἄν, ὡς ἔοικʼ, εἴη τὸ μελετᾶν ὡς ἥκιστα εἶναι ἀναισχύντους τε καὶ θρασύτητος

the greatest possible confidence, and its opposite, the greatest possible fear. Which you called, I think, the marks of modesty. Your memory serves you well. Since courage and fearlessness ought to be practised amidst fears, we have to consider whether the opposite quality ought to be cultivated amidst conditions of the opposite kind. It certainly seems probable. It appears then that we ought to be placed amongst those conditions which naturally tend to make us exceptionally confident and audacious when we are practising how to be as free as possible from shamelessness