The pedagogue Alexandros Delmouzos was a prominent advocate of Greek demoticism and consistently defended Demotic Greek, the low variety in the diglossic linguistic regime of the period, in a series of influential works. In Demoticism and Education (1926), he addressed and refuted the arguments advanced by supporters of Katharevousa, the purist high variety of Greek, in the wake of the Marasleiaka controversy. Although the book is primarily concerned with educational issues, its analysis through the combined perspectives of Critical Discourse Analysis (CDA) and argumentation theory reveals the significant intrusion of political discourse into pedagogical discourse. This paper examines the discursive construction of demoticism and purism, the identities attributed to their respective proponents and the ways in which the Greek language question became intertwined with the ideological and political divisions of the National Schism, particularly the conflict between supporters and opponents of Eleftherios Venizelos.