Cicero, Orat. 9.30-32
“Thucydides, however, tells of history, wars and battles, in a noble and strong way, but nothing he writes can be transferred to forensic or political use. Those well-known speeches have so many unclear and odd phrases that they barely make sense, something which is probably the worst offense in public address.
Do humans possess so much perversity that we will eat acorns after grains have been discovered? Is it possible that the human diet could be changed thanks to Athenian invention but not oratory? Who of the Greek orators, moreover, ever used Thucydides’ work as a model? Surely, he’s praised by everyone. I concede this. But he is praised as a wise explainer of events, a no-nonsense, serious man of the kind who did not pursue cases in court but described battles in history. For this reason, he has never been counted as an orator and would not, indeed, have gained any fame if he had not written history, even though he was noble and elected to office.
Still, no one can really imitate the weight of his words and ideas—but when some people articulate a few broken and unrelated statements, which they could have done even without a teacher, they imagine themselves to be a new-born Thucydides.”
Thucydides autem res gestas et bella narrat et proelia, graviter sane et probe, sed nihil ab eo transferri potest ad forensem usum et publicum. Ipsae illae contiones ita multas habent obscuras abditasque sententias vix ut intellegantur; quod est in oratione civili vitium vel maximum. Quae est autem in hominibus tanta perversitas, ut inventis frugibus glande vescantur? An victus hominum Atheniensium beneficio excoli potuit, oratio non potuit? Quis porro unquam Graecorum rhetorum a Thucydide quicquam duxit? At laudatus est ab omnibus. Fateor; sed ita ut rerum explicator prudens, severus, gravis, non ut in iudiciis versaret causas, sed ut in historiis bella narraret. Itaque nunquam est numeratus orator, nec vero, si historiam non scripsisset, nomen eius exstaret, cum praesertim fuisset honoratus et nobilis. Huius tamen nemo neque verborum neque sententiarum gravitatem imitatur, sed cum mutila quaedam et hiantia locuti sunt, quae vel sine magistro facere potuerunt, germanos se putant esse Thucydidas.