Marcus Aurelius, Ad Se Ipsum

Παρὰ Διογνήτου τὸ ἀκενόσπουδον· καὶ τὸ ἀπιστητικὸν τοῖς ὑπὸ τῶν τερατευομένων καὶ γοήτων περὶ ἐπῳδῶν καὶ περὶ δαιμόνων ἀποπομπῆς καὶ τῶν τοιούτων λεγομένοις· καὶ τὸ μὴ ὀρτυγοτροφεῖν μηδὲ περὶ τὰ τοιαῦτα ἐπτοῆσθαι· καὶ τὸ ἀνέχεσθαι παρρησίας· καὶ τὸ οἰκειωθῆναι φιλοσοφίᾳ καὶ τὸ ἀκοῦσαι πρῶτον μὲν Βακχείου, εἶτα Τανδάσιδος καὶ Μαρκιανοῦ· καὶ τὸ γράψαι διαλόγους ἐν παιδί· καὶ τὸ σκίμποδος καὶ δορᾶς ἐπιθυμῆσαι καὶ ὅσα τοιαῦτα τῆς Ἑλληνικῆς ἀγωγῆς ἐχόμενα.

From Diognetus: not to be zealous about trifles; and to disbelieve what is said by wonder-mongers and sorcerers about incantations and the sending away of daimones [spirits] and such things; and not to keep quails [for fighting], nor to be excited about such things; and to put up with frank speech; and to become at home with philosophy, and to hear first Baccheius, then Tandasis and Marcianus; and to write dialogues as a boy; and to desire the camp-bed and the skin, and whatever else of that kind belongs to the Greek training.