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In Lucan's case, at least, this aspect cannot be said to stem merely from the profound rhetorical influence of the period: since the universe he describes is marked by rupture and fragmentation, the kinds of narrative discontinuities he employs are appropriate to the subject matter.
Thus, Lucan tends to reject the prevailing trend in epic towards an elevated vocabulary, generally preferring to limit himself to a more prosaic terminology in order to remove "epic distance." He is less concerned to embellish his material than present it in a dry, sardonic light.
Lucan's extensive use of sententiae is, no doubt, a direct result of his own rhetorical training, but reflects as well the pervasive influence of rhetoric and declamation on the literature of the period.