τὸν μὲν οὖν τῶν Πυθαγορείων ἱερώτατον θίασον λόγος ἔχει μετὰ πολλῶν καὶ ἄλλων καλῶν καὶ τοῦτ᾿ ἀναδιδάσκειν, “ταῖς λεωφόροις μὴ βαδίζειν ὁδοῖς,” οὐχ ἵνα κρημνοβατῶμεν—οὐ γὰρ ποσὶ κάματον παρήγγελλεν—, ἀλλ᾿ αἰνιττόμενος διὰ συμβόλου τὸ μήτε λόγοις μήτ᾿ ἔργοις δημώδεσι καὶ πεπατημένοις χρῆσθαι.
Pythagoras teaches among other excellent doctrines this also, “walk not on the highways.” This does not mean that we should climb steep hills—the school was not prescribing foot-weariness—but it indicates by this figure that in our words and deeds we should not follow popular and beaten tracks.
-- Philo