Plutarch, An virtus doceri possit, section 3

τί οὖν; ὁ λέγων λειχῆνοσ ἰατρικὴν εἶναι καὶ παρωνυχίασ, πλευρίτιδοσ δὲ καὶ πυρετοῦ καὶ φρενίτιδοσ μὴ εἶναι, τί διαφέρει τοῦ λέγοντοσ ὅτι τῶν μικρῶν καὶ παιδικῶν καθηκόντων εἰσὶ διδασκαλεῖα καὶ λόγοι καὶ ὑποθῆκαι, τῶν δὲ μεγάλων καὶ τελείων ἄλογοσ τριβὴ καὶ περίπτωσίσ ἔστιν;