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.
The Concept of Law
"The Concept of Law" emerged from a set of lectures Hart delivered in 1952. The lectures were preceded by Hart's Holmes lecture, "Positivism and the Separation of Law and Morals" at Harvard Law School. The book developed a sophisticated view of legal positivism.