ἐνεργάζεσθαι
From LSJ
φωνὰ τύ τίς ἐσσι καὶ οὐδὲν ἄλλο → it's all voice you are, and nothing else | it's all voice ye are, and nought else
Greek > English (Woodhouse Verbs Reversed)
(see also ἐνεργάζομαι): engender, foster, produce in persons, produce in things