The “greatest psychologist of the spirit since St. Augustine” (Gregory R. Beabout), Soren Kierkegaard is renowned for such richly imagined philosophical works as Fear and Trembling and The Concept of Anxiety. Yet only The Sickness unto Death condenses his most essential ideas—on aesthetics, ethics and religion—into a single volume.First published in 1849 under the pseudonym Anti-Climacus, The Sickness unto Death is as demanding as it is concise, posing fundamental yet complicated questions about human nature and the self. Beginning with the biblical story of Lazarus, whom Jesus miraculously raised from the dead, The Sickness unto Death identifies the titular “sickness” as “despair”, a state worse than death because it is “unto” death. As Kierkegaard demonstrates, despair—or, in Christian categories, “sin”—is a sickness not of the body but of the spirit and thus, of the self.A dramatic “medical history” of the course of this sickness, The Sickness unto Death culminates, as all medical histories do, in a crisis, a turning point at which the self, the patient, either realises or abandons itself. Given the choice between eternal salvation and extinction, Kierkegaard calls upon the self to become receptive in faith to God’s mercy, “even today, even at this hour, even at this instant”.With his “historian’s eye” (Vanessa Parks Rumble) and “lucid and informative” (George Pattison) introduction, Bruce H. Kirmmse deftly situates The Sickness unto Death in the historical context of the European revolutions of 1848, reminding us that even Kierkegaard was a product of his time and place. Yet as Kirmmse ultimately shows,The Sickness unto Death is as apt for our times as for mid-nineteenth-century Europe, speaking to the human soul across generations and centuries.