Institutio Oratoria

Consequently the

commonplaces on the subject of witnesses, documentary evidence, arguments and the like make a great impression on the minds of the judges, as also do those topics which are peculiar to the case, those I mean in which we praise or blame any action or show that it is just or unjust, or make it seem more or less important or more or less harsh than it really is. Of these topics some are adapted to the comparison of individual arguments, others to the comparison of a number, while others may serve to influence the success or failure of the whole case.