Institutio Oratoria

I note that comparison is also regarded as a figure, although at times it is a form of proof, [*]( See v. xi. 32 (where for hredem read heredi with MSS.) The man to whom the usufruct of a house has been left will not restore it in the interests of the heir if it collapses: just as he would not replace a slave if he should die. ) and at others the whole case may turn upon it, [*](E.g. when the accused admits that he is guilty of a crime, but seeks to show that his wrongdoing was the cause of greater good. ) while its form may be illustrated by the following passage from

You pass wakeful nights that you may be able to reply to your clients; he that he and his army may arrive betimes at their destination. You are roused by cockcrow, he by the bugle's reveille,

I am not sure, however, whether it is so much a figure of thought as of speech. For the only difference lies in the fact that universals are not contrasted with universals, but particulars with particulars. Celsus, however, and that careful writer Visellius regard it as a figure of thought, while Rutilius Lupus regards it as belonging to both, and calls it antithesis.