In the opening sentence of the introduction, Balthasar describes “Kierkegaard’s profound and pellucid study of the ‘concept of anxiety” as “the first and last attempt to deal with the topic theologically.” The present volume represents an attempt to fill this gap. But whereas Freud and Heidegger approach the question in terms of a secularized logic, Balthasar begins by turning (in Part I) towards Revelation, which alone sheds light on the “fragile humanity of our time.” This resolute focus on God’s Word enables Balthasar (in Part II) to unfold a theology of anxiety before going on (in Part III) to engage Kierkegaard and his posterity in critical conversation about the experience of anxiety.