Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
Consequently after surveying our opponent's proposition, an easy task, we should consider, if possible, what it is most natural to answer first. And, if we imagine the case as being actually pleaded and ourselves as under the necessity of making a reply, that answer will probably suggest itself. On the other hand,
if this is impossible, we should put aside whatever first occurs to us and reason with ourselves as follows:
What if this were not the case?We must then repeat the process a second and a third time and so on, until nothing is left for consideration. Thus we shall examine even minor points, by our treatment of which we may perhaps make the judge all the better disposed to us when we come to the main issue.
The rule that we should descend from the common to the particular is much the same, since
He killed a tyrantis common, while
A tyrant was killed by his son, by a woman or by his wifeare all particular.
I used also to note down separately whatever was admitted both by my opponent and myself, provided it suited my purpose, and not merely to press any admissions that he might make, but to multiply them by partition, as for example in the following controversial theme:—
A general, who had stood against his father as a candidate and defeated him, was captured: the envoys who went to ransom him met his father returning from the enemy. He said to the envoys, 'You are too late.' They searched the father and found gold in his pockets. They pursued their journey and found the general crucified. He cried to them, ' Beware of the traitor.' The father is accused.What points are admitted by both parties?
We were told that there had been treason and told it by the general.We try to find the traitor.
You admit that you went to the enemy, that you did so by stealth, that you returned unscathed, that you brought back gold and had it concealed about your person.