Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
Athenaeus laid down that there were four bases: the προτρεπτικὴ or παρορμητική, that is, the hortative, which is peculiar to deliberative themes; the συντελική [*](συντελική lit. = contributory. ) which is shown to be the conjectural, not so much from the name itself, but from what
For, as I have said, there is a great variety in the names employed. There are some who, arguing from its meaning of change, hold that ὑπαλλακτική is the translative basis, which is concerned with competence. Others, Caecilius [*](Caec. fr. 49, Burkh.) and Theon for instance, hold that there are the same number of bases, but make them of a different kind, namely, those covered by the questions whether a thing is, what it is, of what kind it is and how great it is.