Now recognized as one of the nineteenth century's leading psychologists and philosophers. Kierkegaard was among other things the harbinger of exisentialisim. In FEAR AND TREMBLING he explores the psychology of religion, addressing the question 'What is Faith?' in terms of the emotional and psychological relationship between the individual and God. But this difficult question is addressed in the most vivid terms, as Kierkegaard explores different ways of interpreting the ancient story of Abraham and Isaac to make his point.