Plato, Meno 91d

καὶ τούτων φανερῶς χρήματα ἀξιοῦσι πράττεσθαι; ἐγὼ μὲν οὖν οὐκ ἔχω ὅπως σοι πιστεύσω· οἶδα γὰρ ἄνδρα ἕνα Πρωταγόραν πλείω χρήματα κτησάμενον ἀπὸ ταύτης τῆς σοφίας ἢ Φειδίαν τε, ὃς οὕτω περιφανῶς καλὰ ἔργα ἠργάζετο, καὶ ἄλλους δέκα τῶν ἀνδριαντοποιῶν. καίτοι τέρας λέγεις εἰ οἱ μὲν τὰ ὑποδήματα ἐργαζόμενοι τὰ παλαιὰ καὶ τὰ ἱμάτια ἐξακούμενοι οὐκ ἂν δύναιντο λαθεῖν τριάκονθʼ

to anyone placed in their hands? And is it for doing this that they openly claim the payment of fees? For my part I cannot bring myself to believe you; for I know of one man, Protagoras, who amassed more money by his craft than Pheidias—so famous for the noble works he produced—or any ten other sculptors. And yet how surprising that menders of old shoes and furbishers of clothes should not be able to go undetected