“It is as shameful not to learn when you hear something useful as it is not to accept something good offered by loved ones.”
ὁμοίως γὰρ αἰσχρὸν ἀκούσαντα χρήσιμον λόγον μὴ μαθεῖν καὶ διδόμενόν
τι ἀγαθὸν παρὰ τῶν φίλων μὴ λαβεῖν.
Isocrates, Letter to Demonicus 18.4-5