Considered the father of the philosophical movement known as Christian existentialism, which focuses on the living human being, Kierkegaard takes readers on a journey from the human self, its spirit, despair and sin, through to faith in this major 1849 work. Kierkegaard championed the fact that the "single specific individual" was of most importance, and never tired in his attempt to address the universal human concept of despair. He insisted that Christianity was the sole cure for anxiety and despair, and our relationship to God is what defines our selfhood. In Kierkegaard's radical and comprehensive analysis of human nature, we see the origins of the existential movement in modern psychology.