ἐκτήσομαι

From LSJ

ὃς ἂν βούληται τῆν γῆν κινῆσαι κινησάτω τὸ πρῶτον ἑαυτόν → let him that would move the world first move himself

Source

Russian (Dvoretsky)

ἐκτήσομαι: Plat. fut. 3 к κτάομαι.