Passage 8.11.9
τὸν δὲ Ἐπαμινώνδαν τῶν παρʼ Ἕλλησι στρατηγίας ἕνεκα εὐδοκιμησάντων μάλιστα ἐπαινέσαι τις ἂν ἢ ὕστερόν γε οὐδενὸς ποιήσαιτο· Λακεδαιμονίων μὲν γὰρ καὶ Ἀθηναίων τοῖς ἡγεμόσι πόλεών τε ἀξίωμα ὑπῆρχεν ἐκ παλαιοῦ καὶ οἱ στρατιῶται φρονήματός τι ἦσαν ἔχοντες, Θηβαίους δὲ Ἐπαμινώνδας ἀθύμους τὰς γνώμας καὶ ἄλλων ἀκούειν εἰωθότας ἀπέφηνεν ἐν οὐ πολλῷ πρωτεύοντας.
One might praise Epaminondas above all the Greeks who became famous for their generalship, or at least regard him as second to none who came after him. For the rulers of Sparta and Athens long possessed great prestige due to the importance of their cities, and their soldiers always had a certain pride in their spirit. Epaminondas, however, took the Thebans, who were faint-hearted and accustomed to obeying others, and in a short time made them foremost among the Greeks.