Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
If Demosthenes or Cicero had spoken the words as they wrote them, would either have spoken ill And is our acquaintance with either of those two great orators based on anything save their writings? Did they speak better, then, or worse than they wrote? If they spoke worse, all that can be said is that they should have spoken as they wrote, while, if they spoke better, they should have written as they spoke.
Well, you ask, is an orator then always to speak as he writes? If possible, always. If, however, the time allowed by the judge is too short for this to be possible, he will have to cut out much that he should have said, but the published speech will contain the omitted passages. On the other hand, such passages as were uttered merely to suit the character of the judges will not be published for the benefit of posterity, for fear that they should seem to indicate