The Categorical Imperative is supposed to provide a way for us to evaluate moral actions and to make moral judgments. It is not a command to perform specific actions -- it does not say, follow the 10 commandments, or respect your elders.
A blurb on a book can be any combination of quotes from the work, the author, the publisher, reviewers or fans, a summary of the plot, a biography of the author or simply claims about the importance of the work.
The original blurb. A blurb is a short promotional piece accompanying a creative work. It may be written by the author or publisher or quote praise from others. Blurbs were originally printed on the back or rear dust-jacket of a book, and are now found on DVD and video cases, web portals, and news websites. A blurb may introduce a newspaper or magazine feature story.