Passage 9.13.1
τῷ δʼ Ἐπαμινώνδᾳ τὰ μὲν τῶν προγόνων ὑπῆρχεν ἐς γένους δόξαν, ὁ δέ οἱ πατὴρ χρημάτων ἕνεκα μέσου ἀνδρὸς ἀπέδει Θηβαίου· διδάγματα δὲ αὐτοῖς τά τε ἐπιχώρια ἔμαθεν ἐς τὸ ἀκριβέστατον καὶ ὡς ἤδη μειράκιον ἦν ἐφοίτησεν ὡς Λῦσιν, ἄνδρα γένος μὲν Ταραντῖνον, ἐπιστάμενον δὲ τοὺς Πυθαγόρου τοῦ Σαμίου λόγους. λέγεται δὲ ὁ Ἐπαμινώνδας, ἡνίκα ἐπολέμουν Λακεδαιμόνιοι Μαντινεῦσι, πεμφθῆναι σὺν ἄλλοις ἀνδράσιν ἐκ Θηβῶν Λακεδαιμονίοις ἐπαμύνειν· ἔχοντα δὲ τραύματα ἐν τῇ μάχῃ Πελοπίδαν ἐξέσωσεν ἐς ἅπαν ἀφικόμενος κινδύνου.
Epaminondas inherited from his ancestors renown of lineage, though his father's limited financial means placed him within the middle rank of Theban society. His education included meticulous mastery of the customary native subjects, and when he was already a youth he studied under Lysis, a man who was by birth from Tarentum and knowledgeable in the doctrines of Pythagoras of Samos. It is said that when the Lacedaemonians were at war with the Mantineans, Epaminondas was sent along with other men from Thebes to assist the Lacedaemonians. During the battle, he himself sustained wounds, yet saved Pelopidas, who had been injured, rescuing him at the utmost risk to his own life.