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.
Definition of blurb for English Language Learners. : a short description that praises something (such as a book) so that people will want to buy it. See words that rhyme with blurb Spanish Central: Translation of blurb Nglish: Translation of blurb for Spanish speakers Britannica English: Translation of blurb for Arabic speakers.