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... iuventa Augusti versata est. nec mihi tela et manus...

nec...agenti: a compressed past contrary-to-fact conditional clause, "nor would your weapons and your handz have been lacking ("defuissent") to me (Furneaux translates "personal services") if I had been acting ("agenti" in agreement w. "mihi") in arms. Nero compares the services of Seneca to him with those of Agrippa to Augustus.