Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
For every question has its basis, since every question is based on assertion by one party and denial by another. But there are some questions which form an essential part of causes, and it is on these that we have to express an opinion; while others are introduced from without and are, strictly speaking, irrelevant, although they may contribute something of a subsidiary nature to the general contention. It is for this reason that there are said to be several questions in one matter of dispute.
Of these questions it is often the most trivial which occupies the first place. For it is a frequent artifice to drop those points in which we place least confidence, as soon as we have dealt with them; sometimes we make a free gift of them to our