πολλάκις δοκεῖ τὸ φυλάξαι τἀγαθὰ τοῦ κτήσασθαι χαλεπώτερον εἶναι → it often proves harder to keep than to win prosperity | it is often harder for men to keep the good they have, than it was to obtain it
-η, -ο (AM ἀποδεδειγμένος, -η, -ον)
βλ. αποδεικνύω.