Just as the good physician should go and offer his services where the sick are most numerous, so, said [Diogenes], the man of wisdom should take up his abode where fools are thickest in order to convict them of their folly and reprove them.
δεῖν οὖν τὸν φρόνιμον ἄνδρα, ὥσπερ τὸν ἀγαθὸν ἰατρόν, ὅπου πλεῖστοι κάμνουσιν, ἐκεῖσε ἰέναι βοηθήσοντα, οὕτως ὅπου πλεῖστοί εἰσιν ἄφρονες, ἐκεῖ μάλιστα ἐπιδημεῖν, ἐξελέγχοντα καὶ κολάζοντα τὴν ἄνοιαν αὐτῶν.
Original text (Ancient Greek)