roots. For Campbell, the path to persuasion passes through each of the faculties in turn--understanding, imagination, passion, and will. Because of this, rhetoric must first appeal to the understanding and produce conviction, and without this persuasion cannot follow. Campbell says there are two kinds of reasoning, scientific and moral. Scientific reasoning relies on general principles, and from these it proceeds to produce a conclusion by a chain of logical links. Moral reasoning, however, takes precedence in human affairs concerning subjects such as pleasure and pain, wisdom and folly, and beauty and deformity.
LaRusso refers to an earlier argument between Ehninger and Douglas McDermott on the question of the value of Campbell's work:
Quite briefly, Ehninger is inclined to champion Campbell's work as a revolutionary movement away from certain rhetorical traditions concerned with audience and definition and use of artistic proofs. McDermott challenges Ehninger's conclusions by reinterpreting
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