Plato, Laws 639c

τί δʼ ἐπαινέτην ἢ ψέκτην κοινωνίας ἡστινοσοῦν ᾗ πέφυκέν τε ἄρχων εἶναι μετʼ ἐκείνου τε ὠφέλιμός ἐστιν, ὁ δὲ μήτε ἑωρακὼς εἴη ποτʼ ὀρθῶς αὐτὴν αὑτῇ κοινωνοῦσαν μετʼ ἄρχοντος, ἀεὶ δὲ ἄναρχον ἢ μετὰ κακῶν ἀρχόντων συνοῦσαν; οἰόμεθα δή ποτε τοὺς τοιούτους θεωροὺς τῶν τοιούτων κοινωνιῶν χρηστόν τι ψέξειν ἢ ἐπαινέσεσθαι; πῶς δʼ ἄν, μηδέποτέ γε ἰδόντας μηδὲ συγγενομένους

Now take the case of any social institution whatsoever which naturally has a commander and which, under its commander, is beneficial; and suppose that someone, who had never seen the conduct of the institution under its commander, but seen it only when with no commander or bad commanders, were to commend the institution or censure it: do we imagine that either the praise or the blame of such an observer of such an institution is of any value? Certainly not, when the man has never seen nor shared in an institution of the kind