A Physician Reprimanded

Τέκνην ἐπαγέλλῃ φιλόσοφον, γνώμην δὲ μετέρχῃ κακόσχολον, μικρὰ θεραπεύων τραυμάτια, μεγάλα δὲ νοσῶν ἐξελκώματα. Εἰ τοίνυν ἰατρὸς βούλει φανῆναι τῷ πράγματι, σαυτοῦ τὸν τρόπον θεράπευσον. Ψυχρὸν γὰρ καὶ γελοῖον καὶ ἄχαρι, ἄλλους πειρᾶσθαι ἰᾶσθαι, ἑαυτὸν δὲ παρορᾷν ἀσθενοῦντα. Ἅγιος Ἰσίδωρος Του Πηλουσιώτου, Βιβλίον Πρῶτον, Ἐπιστολὴ ΤϟΑ' Δομεστιῳ Ιατρῳ Source: Migne PG 78.404a

You declare yourself wise in your art but bear about a mind embroiled in worthless study, curing trifling wounds while burdened with grave diseases. If, then, you wish to appear a physician in your acts, look to the healing of your own conduct. Stupid and ridiculous and graceless it is that he who tries to treat others, neglects to attend to his own infirmities. Saint Isidore of Pelusium, Book 1, Letter 391, to Domestius The Physician