Plato, Meno 97a

ὀρθῶς ὡμολογήκαμεν τοῦτό γε ὅτι οὐκ ἂν ἄλλως ἔχοι· ἦ γάρ; ναί. καὶ ὅτι γε ὠφέλιμοι ἔσονται, ἂν ὀρθῶς ἡμῖν ἡγῶνται τῶν πραγμάτων, καὶ τοῦτό που καλῶς ὡμολογοῦμεν; ναί. ὅτι δʼ οὐκ ἔστιν ὀρθῶς ἡγεῖσθαι, ἐὰν μὴ φρόνιμος ᾖ, τοῦτο ὅμοιοί ἐσμεν οὐκ ὀρθῶς ὡμολογηκόσιν. πῶς δὴ λέγεις; ἐγὼ ἐρῶ. εἰ εἰδὼς τὴν ὁδὸν τὴν εἰς Λάρισαν ἢ ὅποι βούλει ἄλλοσε βαδίζοι καὶ ἄλλοις ἡγοῖτο, ἄλλο τι ὀρθῶς ἂν καὶ εὖ ἡγοῖτο; πάνυ γε.

this must needs be so? Yes. And in thinking that they will be useful if they give us right guidance in conduct: here also, I suppose, our admission was correct? Yes. But our assertion that it is impossible to give right guidance unless one has knowledge looks very like a mistake. What do you mean by that? I will tell you. If a man knew the way to Larisa, or any other place you please, and walked there and led others, would he not give right and good guidance? Certainly.