Plato, Laws 732a

κρίνει, τὸ αὑτοῦ πρὸ τοῦ ἀληθοῦς ἀεὶ τιμᾶν δεῖν ἡγούμενος· οὔτε γὰρ ἑαυτὸν οὔτε τὰ ἑαυτοῦ χρὴ τόν γε μέγαν ἄνδρα ἐσόμενον στέργειν, ἀλλὰ τὰ δίκαια, ἐάντε παρʼ αὑτῷ ἐάντε παρʼ ἄλλῳ μᾶλλον πραττόμενα τυγχάνῃ. ἐκ ταὐτοῦ δὲ ἁμαρτήματος τούτου καὶ τὸ τὴν ἀμαθίαν τὴν παρʼ αὑτῷ δοκεῖν σοφίαν εἶναι γέγονε πᾶσιν· ὅθεν οὐκ εἰδότες ὡς ἔπος εἰπεῖν οὐδέν, οἰόμεθα τὰ πάντα εἰδέναι, οὐκ ἐπιτρέποντες δὲ

bound always to value what is his own more than what is true; for the man who is to attain the title of Great must be devoted neither to himself nor to his own belongings, but to things just, whether they happen to be actions of his own or rather those of another man. And it is from this same sin that every man has derived the further notion that his own folly is wisdom; whence it comes about that though we know practically nothing, we fancy that we know everything; and since we will not entrust to others the doing of things we do not understand,