Plato, Laws 648d

τις ἀεὶ βούλοιτο· καὶ εἴτε τις ἄρα μόνος ἐν ἐρημίᾳ, τὸ τῆς αἰσχύνης ἐπίπροσθεν ποιούμενος, πρὶν εὖ σχεῖν ἡγούμενος ὁρᾶσθαι μὴ δεῖν, οὕτω πρὸς τοὺς φόβους γυμνάζοιτο, πῶμα μόνον ἀντὶ μυρίων πραγμάτων παρασκευαζόμενος, ὀρθῶς ἄν τι πράττοι, εἴτε τις ἑαυτῷ πιστεύων φύσει καὶ μελέτῃ καλῶς παρεσκευάσθαι, μηδὲν ὀκνοῖ μετὰ συμποτῶν πλειόνων γυμναζόμενος ἐπιδείκνυσθαι τὴν ἐν τῇ τοῦ πώματος ἀναγκαίᾳ

or to groups ever so large. Suppose, then, that a man, actuated by a feeling of shame and loth to show himself in public before he was in the best of condition, should remain alone by himself while undergoing this training against fears and relying on the potion alone for his solitary equipment, instead of endless exercises,—he would be acting quite rightly: so too would he who, trusting in himself that by nature and practice he is already well equipped, should have no hesitation in training in company with a number of drinking companions and showing off how for speed and strength he is superior to the potency of the draughts he is obliged to drink,