Institutio Oratoria
Quintilian
Quintilian. Institutio Oratoria, Volume 1-4. Butler, Harold Edgeworth, translator. Cambridge, Mass; London: Harvard University Press, William Heinemann Ltd., 1920-1922.
If, however, part of the statement of facts tells in our favour and part against us, we must consider whether in view of the circumstances of the case the parts in question should be blent or kept apart. If the points which are damaging to our case be in the majority, the points which are in its favour will be swamped. Under those circumstances it will be best to keep them apart and, after setting forth and proving the points which help our case, to meet the rest by employing the remedies mentioned above.
If, on the other hand, it be the points in our favour which predominate, we may even blend them with the others, since thus the traitors in our camp will have less force. None the less these points, both good and bad, must not be set forth naked and helpless: those in our favour must be supported by some argument, and then reasons must be added why the points which tell against us should not be believed; since if we do not distinguish clearly between the two, it is to be feared that those which are favourable may suffer from their bad company.
Further rules are laid down with regard to the