μεγάλα ὠφελήσεσθε πρὸς ἱστορίαν τῶν κοινῶν → that will be of great benefit to you in order to understand public affairs
κατέχω, εἴργω, εἵργω, ἔργω, ἔργνυμι, ἐέργω, ἐέργνυμι, ἐπίσχω