Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
In such cases the defence must always come first for three reasons. In the first place, we naturally prefer to secure our own safety than to injure our opponent, while secondly, our accusation will carry greater weight if we have first proved our own innocence, and thirdly, we shall thus secure a double line of defence. For the man who says,
I did not kill him,is then free to go on to say,
You killed him,whereas it is superfluous for the man who says,
You killed him,to go on to say,
I did not kill him.
Further, such cases consist of comparison, which may be effected in different ways. For we may either compare our case in its entirety with that of our adversary, or we may compare individual arguments. The choice between these two methods can only be determined by the requirements of the case. For example, in the pro Vareno, Cicero, in dealing with the first charge, compares the individual arguments: for it would have been rash in connexion with the second charge to compare the position of a stranger with that of a mother. [*]( The pro Vareno being lost, it is impossible to say to what this refers, and for the same reason Halm's conjecture must be regarded as quite uncertain. ) It is therefore best, if possible, to refute argument by individual argument: if, however, our individual arguments are weak, we shall try to secure success by comparison of case with case as a whole.