The original conception of Dialectic, as exhibited, for instance, in Plato’s Republic, hardly answers to this. According to Plato, the aim of Dialectic, so far from being destructive, was distinctly edifying. The Dialectic method, as its name implies, was one which took the external form of question and answer. It had a definite, positive object, viz., the attainment by force of pure reason to the clear vision of the Absolute Good, the ultimate cause of knowledge and existence. The sphere of Dialectic was pure reason, then, and its object the ultimate truth of things. (Republic, VII. p. 532.) The method which St. Ambrose here calls “Dialectic” would have been more correctly entitled “Elenchus.”