Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
The second sense in which the word propriety is used occurs when there are a number of things all called by the same name: in this case the original term from which the others are derived is styled the proper term.
are employed as names of fish, to mention no other cases. [*]( Lit. i. e. in the proper sense the sole of the foot and a thrush. ) The third kind of propriety is found in the case where a thing which serves a number of purposes has a special name in some one particular context; for example, the proper term for a funeral song is naenia, and for the general's tent augurale. Again, a term which is common to a number of things may be applied in a proper or special sense to some one of them. Thus we use urbs in the special sense of Rome, venales in the special sense of newly-purchased slaves, and Corinthia in the special sense of bronzes, although there are other cities besides Rome, and many other things which may be styled venales besides slaves, and gold and silver are found at Corinth as well as bronze. But the use of such terms implies no special excellence in an orator.
There is, however, a form of propriety of speech which deserves the highest praise, that is to say, the employment of words with the maximum of significance, as, for instance, when Cato [*](Suet. Caes. 53. ) said that
Caesar was thoroughly sober when he undertook the task of overthrowing the constitution,or as Virgil [*](Ecl. vi. 5. ) spoke of a
thin-drawn strain,and Horace [*](Odes I. xii. 1, and III. vi. 36. ) of the
shrill pipe,and
dread Hannibal.