The sickness unto death : a Christian psychological exposition of edification and awakening

The Sickness Unto Death is famed for the depth and acuity of its modern psychological insights.

Writing under the pseudonym Anti-Climacus, Kierkegaard explores the concept of 'despair', alerting readers to the diversity of ways in which they may be described as living in this state of bleak abandonment - including some that may seem just the opposite - and offering a much-discussed formula for the eradication of despair.

This late work was hugely influential upon twentieth-century philosophers including Jaspers, Sartre and Camus and it can be regarded as one of the key works of theistic existentialist thought.