Stuart Peterfreund suggests that lines 21-26, among others, shows how Shelley is "struggling with the issues of fetishism and sexual possession that bedeviled the poet in Alastor," and that "Emily is figured in terms reminiscent of the transfigured Beatrice in [Longfellow's] Paradiso." Peterfreund argues that Shelley's concern with language "that veils or unveils" shows a fetishism for Emily and language's preventative blockade between himself and his possession of her (277).
Peterfreund, Stuart. Shelley Among Others : The Play of the Intertext and the Idea of Language. Baltimore: Johns Hopkins UP, 2002.