Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
These subtle teachers (for such they have persuaded themselves and others that they are) have laid it down that the παράδειγμα [*](Sec v. xi. 1. Parallels and especially historical ones.) is best suited for actual speech and the ἐνθύμημα [*]( See v. xiv. 1 sqq. A form of syllogism. ) for writing. My own view is that there is absolutely no difference between writing well and speaking well, and that a written speech is merely a record of one that has actually been delivered. Consequently it must in my opinion possess every kind of merit, and note that I say merit, not fault. For I know that faults do sometimes meet with the approval of the uneducated.