Institutio Oratoria

I am aware that some writers have shown pedantic zeal in making a minute classification of similes, and have pointed out that there is lesser similitude (such as that of a monkey to a man or a statue when first blocked out to its original), a greater similitude (for which compare the proverb

As like as egg to egg

So too they distinguish between contraries: some are opposites, as night to day, some hurtful, as cold water to a fever, some contradictory, as truth to falsehood, and some negative, as things which are not hard when contrasted with things which are hard. But I cannot see that such distinctions have any real bearing on the subject under discussion.

It is more important for our purpose to note that arguments may be drawn from similar, opposite, and dissimilar points of law. As an example of the first, take the following passage from the Topica of Cicero, [*](iii. 15.) where he argues that a man to whom the usufruct of a house has been left will not restore it in the interests of the heir if it collapses; just as lie would not replace a slave if he should die. The following will provide an example of an argument drawn from opposite points of law:

The absence of a formal contract is no bar to the legality of a marriage, provided the parties cohabit by mutual consent, since the signing of a formal document will count for nothing in the absence of such mutual consent.

If anyone had driven me from my house by armed violence, I should have ground for action against him. Have I then no ground, if he has prevented me from entering my house?

Because a man has bequeathed all his silver to a given person and this bequest is regarded as including silver coin as well as plate, it does not follow that he intended all outstanding debts to be paid to the legatee.

Some draw a distinction between analogy and similarly, but personally I regard the former as included under the latter. For the statement that the relation of 1 to 10 is the same as that of 10 to certainly involves similarity,

just as does the statement that a bad citizen may be compared to an actual enemy. But arguments of this kind are carried still further:

If connexion with a male

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slave is disgraceful to the mistress of the house, so is the connexion of the master with a female slave. If pleasure is an end sought by dumb animals, so also must it be with men.

But these arguments may readily be met by arguments from dissimilars:

It is not the same thing for the master of the house to have intercourse with a female slave as for the mistress to have intercourse with a male slave; nor does it follow that because dumb animals pursue pleasure, reasoning beings should do likewise.

Because pleasure is an end sought by dumb animals, it should not be sought by reasoning beings.

Authority also may be drawn from external sources to support a case. Those who follow the Greeks, who call such arguments κρίσεις, style them judgments or adjudications, thereby referring not to matters on which judicial sentence has been pronounced (for such decisions form examples or precedents), but to whatever may be regarded as expressing the opinion of nations, peoples, philosophers, distinguished citizens, or illustrious poets. Nay,

even common sayings and popular beliefs may be found to be useful. For they form a sort of testimony, which is rendered all the more impressive by the fact that it was not given to suit special cases, but was the utterance or action of minds swayed neither by prejudice or influence, simply because it seemed the most honourable or honest thing to say or do.

For instance, if I am speaking of the misfortunes of this mortal life, surely it will help me to adduce the opinion of those nations who hold that we should weep over the new-born child and rejoice

do we not regard the precepts of the Seven Wise Men as so many rules of life? If an adulteress is on her trial for poisoning, is she not already to be regarded as condemned by the judgment of Marcus Cato, who asserted that every adulteress was as good as a poisoner? As for reflexions drawn from the poets, not only speeches, but even the works of the philosophers, are full of them; for although the philosophers think everything inferior to their own precepts and writings, they have not thought it beneath their dignity to quote numbers of lines from the poets to lend authority to their statements.