Sren Kierkegaard (18131855), the Danish theologian, philosopher, and preacher, in his last years issued a blistering attack on the established Christianity of the nineteenth century. That challenge was also a summons to an authentic life of Christian faith. With intensity and acumen, Kierkegaard diagnosed the spiritual and intellectual ills of modernity and Christendom and offered a constructive "upbuilding" for active, faithful Christian existence...