Institutio Oratoria

For an argument must needs tell against a speaker if it be one which his opponent can use with effect.

But, you say, it is not probable that a crime of this magnitude was designed by Marcus Cotta. Is it probable then that a crime of this magnitude was attempted by Oppius?

accuses Ligarius of having been in Africa, and complains that Ligarius refused to allow him to land in Africa. At times, however, some ill-advised statement by our opponent will give us an opportunity of demolishing his arguments. This is specially likely to occur with speakers who have a passion for producing impressive thoughts: for the temptation to air their eloquence is such that they take no heed of what they have said already, being absorbed by the topic immediately before them to the detriment of the interests of the case as a whole.

What is there likely to tell so heavily against Cluentius as the stigma inflicted by the censors? What can be more damaging than the fact that Egnatius disinherited his son on the ground that lie had been bribed to give a false verdict in the trial in which Cluentius secured the condemnation of Oppianicus? But Cicero [*](pro Cluent. xlviii. 135. )

shows that the two facts tell against one another.

But, Attius, I would urge you to give the closest consideration to the following problem. Which do you desire to carry the greater weight—the judgment of the censors, or of Egnatius? If the latter, you regard the judgment of the censors in other cases as counting for little, since they expelled this same Gnaeus Egnatius, on whose authority you lay such stress, from his place in the senate. On the other hand, if you attach most weight to the judgment of the censors, I must point out that the censors retained the younger Egnatius, whom his father disinherited by an act resembling a censorial decision, in his position as senator, although they had expelled his father.