Prefaces (Danish: Forord) is a book by Søren Kierkegaard published under the pseudonym Nicolaus Notabene. The meaning of the pseudonym used for Prefaces, Nicholaus Notabene, was best summed up in his work Writing Sampler, where Kierkegaard said twice for emphasis, “Please read the following preface, because it contains things of the utmost importance.” He was trying to tell his critics to read the preface to his books because they have the key to understanding them. Nota bene is Latin for "note well".