Brain Drain

Strabo 14.5.13 (tr. Horace Leonard Jones):

The people at Tarsus have devoted themselves so eagerly, not only to philosophy, but also to the whole round of education in general, that they have surpassed Athens, Alexandria, or any other place that can be named where there have been schools and lectures of philosophers. But it is so different from other cities that there the men who are fond of learning are all natives, and foreigners are not inclined to sojourn there; neither do these natives stay there, but they complete their education abroad; and when they have completed it they are pleased to live abroad, and but few go back home.

τοσαύτη δὲ τοῖς ἐνθάδε ἀνθρώποις σπουδὴ πρός τε φιλοσοφίαν καὶ τὴν ἄλλην παιδείαν ἐγκύκλιον ἅπασαν γέγονεν, ὥσθ᾿ ὑπερβέβληνται καὶ Ἀθήνας καὶ Ἀλεξάνδρειαν καὶ εἴ τινα ἄλλον τόπον δυνατὸν εἰπεῖν, ἐν ᾧ σχολαὶ καὶ διατριβαὶ φιλοσόφων γεγόνασι. διαφέρει δὲ τοσοῦτον, ὅτι ἐνταῦθα μὲν οἱ φιλομαθοῦντες ἐπιχώριοι πάντες εἰσί, ξένοι δ᾿ οὐκ ἐπιδημοῦσι ῥᾳδίως· οὐδ᾿ αὐτοὶ οὗτοι μένουσιν αὐτόθι, ἀλλὰ καὶ τελειοῦνται ἐκδημήσαντες, καὶ τελειωθέντες ξενιτεύουσιν ἡδέως, κατέρχονται δ᾿ ὀλίγοι.