However, this relationship is by no means one-sided. Attacks on Christendom argues for the importance of Bonhoeffer as an interpreter of Kierkegaard, drawing Kierkegaard's thought into his own unique context, forcing Kierkegaard to answer very different questions. Bonhoeffer helps in converting the obscure, obdurate Dane into a thinker for his own, unique age.
Both Kierkegaard and Bonhoeffer have been criticized and misunderstood for their final works that lay bare the religious climates of their nations. In the final analysis, Attacks on Christendom argues that these works are not unfortunate endings to their careers, but rather their fulfilment, drawing together the themes that had been brewing throughout their work.
In The Concept of Anxiety, Kierkegaard describes the nature and forms of anxiety, placing the domain of anxiety within the mental-emotional states of human existence that precede the qualitative leap of faith to the spiritual state of Christianity. It is through anxiety that the self becomes aware of its dialectical relation between the finite and the infinite, the temporal and the eternal.
(by Robert L. Perkins, Editor, International Kierkegaard Commentary)