Institutio Oratoria

On the other hand, if the allegation is irrelevant to the actual case and no more than accessory, I should prefer simply to state that it has nothing to do with the question at issue, that it is not worth our attention, and that it has not the importance given to it by our opponent, though in such a case I should be prepared to pardon a policy of ignoring the charge such as I have just mentioned. For a good advocate ought not to be afraid of incurring a trivial censure for negligence, if such apparent negligence is likely to save his client.

We must further consider whether we should

if it is difficult to refute the statements made by our opponents, we may compare our arguments with theirs, at least if by such a procedure it is possible to prove the superiority of our own. On the other hand, those arguments which rely on their cumulative force must be analysed individually, as for example in the case which I cited above:

You were the heir, you were poor and were summoned by your creditors for a large sum: you had offended him and knew that he intended to change his will.

The cumulative force of these arguments is damaging. But if you refute them singly, the flame which derived its strength from the mass of fuel will die down as soon as the material which fed it is separated, just as if we divert a great stream into a number of channels we may cross it where we will. We shall therefore adapt our method of refutation to the exigencies of our case, now dealing with individual arguments and now treating them in bulk.