The Concept of Anxiety
All of Kierkegaard's books have either a preface, dedication, or prayer at the beginning. This book includes a lengthy introduction. "The Concept of Anxiety" was published on exactly the same date as "Prefaces", June 17, 1844. Both books deal with Hegel’s idea of mediation. Mediation is a common thread throughout Kierkegaard’s works. His work up to this point was to show that faith was being mediated by knowledge. Here he takes up the questions of sin and guilt.
Edifying Discourses in Diverse Spirits
Edifying Discourses in Diverse Spirits, also Upbuilding Discourses in Various Spirits was published on March 13, 1847, by Søren Kierkegaard. The book is divided into three parts just as "Either/Or" was in 1843 and many of his other discourses were. Kierkegaard had been working toward creating a place for the concepts of guilt and sin in the conscience of the single individual. He discussed the ideas generated by both Johann von Goethe and Friedrich Hegel concerning reason and nature. This book is his response to the ideas that nature and reason are perfect.