Without these three integrated dimensions, ethos, logos and pathos make no sense. If these aspects are broken down into socioantropology, morality, techniques of argumentation, public relations etc., the main essence of rhetoric disappears. Inspiring theories of psychology and social psychology on the structure of consciousness. Looking at man as a rhetorical animal where the relation between language, thought and action is a central theme. Not even scientific texts are mere subject matter, but follow general rules of rhetoric .
Rhetoric is in itself a theory of knowledge.
The rhetorical approach includes the existence of the logical approach. The logical demonstration, however, denies the need for the rhetorical theory of knowledge. You may find a similar relation between positivism and hermeneutics. Positivism excludes while hermeneutics includes. Because Perelman looks to a juridical model of truth rather than a mathematical one, he does not assume, as does Descartes, that only one side can be right in a dispute.