Against the Professors, Books I-VI of Against the Learned Section 32

οὔτε ὁ ἄτεχνος τὸν τεχνίτην· ὅμοιον γὰρ ὡς εἴ τις λέγοι τὸν βλέποντα ὑπὸ τοῦ πεπηρωμένου ὁδη- γεῖσθαι. καὶ γὰρ ὁ ἄτεχνος πρὸς τὰ τεχνικὰ τῶν θεω- ρημάτων πεπηρωμένος οὐκ ἂν δύναιτό τινα διδάσκειν ἂ μηδὲ τὴν ἀρχὴν οἶδεν, καὶ ὁ τεχνίτης διαβλέπων ἐν τοῖς τεχνικοῖς θεωρήμασι καὶ γνῶσιν αὐτῶν ἐσχηκὼς οὐ δεή- σεται τοῦ διδάξοντος.

Nor can the unskilled person teach the expert, for that would be like saying that one who sees is guided by one who is blind. The unskilled person, being blind to technical principles, cannot teach anyone things of which he has no knowledge at all; while the expert, seeing clearly in technical principles and possessing knowledge of them, will not need anyone to teach him.

L’homme sans art ne peut pas davantage enseigner à l’homme de l’art. Ce serait comme dire que celui qui voit est guidé par un aveugle. Car l’homme sans art, aveugle aux théorèmes techniques, ne saurait enseigner à quelqu’un ce qu’il ne connaît absolument pas, tandis que l’homme de l’art, qui voit clairement ces théorèmes et en possède la connaissance, n’aura pas besoin d’un enseignant.