Book 3
1.48
They say that Zeno the Eleatic was the first to write dialogues. But, according to Favorinus in his Memorabilia, Aristotle in the first book of his dialogue On Poets asserts that it was Alexamenus of Styra or Teos. In my opinion Plato, who brought this form of writing to perfection, ought to be adjudged the prize for its invention as well as for its embellishment. A dialogue is a discourse consisting of question and answer on some philosophical or political subject, with due regard to the characters of the persons introduced and the choice of diction. Dialectic is the art of discourse by which we either refute or establish some proposition by means of question and answer on the part of the interlocutors.
1.49
Of the Platonic dialogues there are two most general types, the one adapted for instruction and the other for inquiry. And the former is further divided into two types, the theoretical and the practical. And of these the theoretical is divided into the physical and logical, and the practical into the ethical and political. The dialogue of inquiry also has two main divisions, the one of which aims at training the mind and the other at victory in controversy. Again, the part which aims at training the mind has two subdivisions, the one akin to the midwife’s art, the other merely tentative. And that suited to controversy is also subdivided into one part which raises critical objections, and another which is subversive of the main position.
