In the year 1844, one of the most productive of his career, publishes Søren Kierkegaard, within a few days, the three writings gathered here: Philosophical crumbs, The concept of anguish and Prologues. Their stylistic heterogeneity and the diversity of their content make them appear with the signature of three different pseudonyms: Johannes Climacus, Vigilius Haufniensis and Nicolaus Notabene, respectively. The crumbs expose the limitations of philosophical thought when it comes to the individual appropriation of the truth. Climacus directs his gaze to the type of learning of truth represented by Socratic maieutics and Christianity. The concept of anguish undertakes a joint discussion of the psychological question of anguish and the dogmatic question of hereditary sin. The anguish is characterized by its psychological ambiguity, for being a "sympathetic antipathy." As Kierkegaard writes in his diary, "Anxiety is a strange power that seizes the individual, but being free of it is something that the individual can not and does not want, since one fears, but what one fears is what one desires. » The Prologues reflect the particular interest of Kierkegaard in this literary form. It is a series of eight prefaces to non-existent books, preceded in turn by a prologue that claims the emancipation of the "prologue" text in its ambiguous nature: to be able to "deal with nothing".