This article was one major paragraph explaining what was the purpose in an upcoming chapter. Within this paragraph there does seem to be a main idea, a body & supporting sentences, a conclusion all concerning global linguistics categories.
The paragraph spoke of the relations of language to society. These realtions were put into global linguistic categories. The conclusion of the article spoke of the statements concerning global categories, whole languages & individual linguistic items. In each case the statement spoke of the speaker as either a member of some community or as on individual.