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.
6 Synonyms found for blurb. blurb 1907, coined by U.S. humorist Gelett Burgess (1866-1951) to mock excessive praise printed on book jackets. But also sometimes attributed to U.S. scholar Brander Matthews (1852-1929).