Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
However on all occasions when we have employed the exordium, whether we intend to pass to the statement of facts or direct to the proof, our intention should be mentioned at the conclusion of the introduction, with the result that the transition to what follows will be smooth and easy.
There is indeed a pedantic and childish affectation in vogue in the schools of
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marking the transition by some epigram and seeking to win applause by this feat of legerdemain. Ovid is given to this form of affectation in his Metamorphoses, but there is some excuse for him owing to the fact that he is compelled to weld together subjects of the most diverse nature so as to form a continuous whole.