In short, we reserve the term “topic” to refer to what a proposition is about. Grammatically speaking, the topic of a proposition is often the subject of a clause, but this is not always the case and the two should not be equated. As for the term “theme”, we will continue to use this in its more traditional sense to refer to the broader subject matter of a discourse, relative to the level of discourse at which that theme is in play. This broader subject may form a “theme line,” meaning a series of