Institutio Oratoria

For just as the melody of the voice is most pleasing when accompanied by the lyre, yet if the musician's hand be slow and, unless he first look at the strings and take their measure, hesitate as to which strings match the several notes of the voice, it would be better that he should content himself with the natural music of the voice unaccompanied by any instrument; even so our theory of speaking must be adapted and, like the lyre, attuned to such rules as these.

But it is only by constant practice that we can secure that, just as the hands of the musician, even though his eyes be turned elsewhere, produce bass, treble or intermediate notes by force of habit, so the thought of the orator should suffer no delay owing to the variety and number of possible arguments, but that the latter should present themselves uncalled and, just as letters and syllables require no thought on the part of a writer, so arguments should spontaneously follow the thought of the orator.

The third kind of proof, which is drawn into the service of the case from without, is styled a παράδειγμα by the Greeks, who apply the term to all comparisons of like with like, but more especially to historical parallels. Roman writers have for the most part preferred to give the name of comparison to that which the Greeks style παραβολή, while they translate παράδειγμα by example, although this latter involves comparison, while the former is of

For my own part, I prefer with a view to making my purpose easier of apprehension to regard both as παραδείγματα and to call them examples. Nor am I afraid of being thought to disagree with Cicero, although he does separate comparison from example. [*](de Inv. I. xxx. 49. ) For he divides all arguments into two classes, induction and ratiocination, just as most Greeks [*]( cp. Ar. ah. I. ii. 18. ) divide it into παραδείγματα and ἐπιχειρήματα, explaining παράδειγμα as a rhetorical induction.

The method of argument chiefly used by Socrates was of this nature: when he had asked a number of questions to which his adversary could only agree, he finally inferred the conclusion of the problem under discussion from its resemblance to the points already conceded. This method is known as induction, and though it cannot be used in a set speech, it is usual in a speech to assume that which takes the form of a question in dialogue.

For instance take the following question:

What is the finest form of fruit? Is it not that which is best?

What of the horse? What is the finest? Is it not that which is the best?

What of man? Is not he the finest type who is best?