After Kant and Hegel no other philosopher of modern times, so the German theologian Karl Lehmann claims, has influenced the development of theology more than Martin Heidegger. This statement seems to be surprising because it is also a common opinion that Heidegger abandoned the Christian faith in general, when he turned away from theology and became a philosopher instead. It is the intention of Judith Wolfe to show in her introduction to Heidegger that for him the discussion with Christian faith and theology was a lifelong project, which shaped the philosophy of Heidegger itself and also the approach to the theological projects of many theologians. Judith Wolfe already presented in Heidegger's Eschatology (2013) her wide and thorough knowledge of Heidegger's relation to one particular subject within theology. Now she leads us in this study through the development of Heidegger from his origins in South-German Catholicism, his early years as a student of Catholic theology, to the world-famous philosopher and intellectual, who influenced several generations of academics – philosophers and theologians – inside and outside of Germany.

The book presents in eight chapters the context and the development of Heidegger's work, his dialogue with various theologians, and his reception by theologians, both Protestant and Catholic, like Bultmann, Barth, Rahner and Edith Stein. Wolfe draws on an extensive range of sources, many of which have never been translated into English. With her profound knowledge of Heidegger's work she is able to point out the main issues regarding his philosophy and its relation to theology. Heidegger, who had started as a student of Catholic theology, abandoned the neo-scholastic model of theology and Catholicism, because he felt that the Catholic system was an obstacle to real philosophical thinking, which had to start without any presuppositions. This scepticism against any fixed system shapes his whole approach to theological concepts, which nevertheless accompany his own development. This is also the reason why Heidegger draws a sharp line between theology and philosophy, because theology claims to have answers, whereas real philosophical thinking can only present questions. As Heidegger repeatedly states, God is not identical with Being and the question therefore remains, if God, whose expected appearance is the only hope of human salvation, according to an interview in the 1960s, can be in any way identified with the God of the Christian faith. Wolfe shows in her work the complexity of Heidegger's thinking, which cannot be easily adopted by theologians, but which nevertheless remains a critical counterpart for theology.

The most controversial part of the book is without any doubt the chapter on Heidegger and his relation to National Socialism, which up to today causes furious and contentious debate among academics and intellectuals. Judith Wolfe now tries to explain the entanglement of Heidegger with the Nazi-ideology by situating him within the broader context of German nationalism, starting with the early 19^th century. She shows how this nationalism was charged with a semi-religious idea of the messianic role of Germany in world history, which even showed an eschatological perspective. Not only Heidegger later identified this coming of a new German ‘Reich’, which also included the theological connotation of the Kingdom of God, with the new movement of the Nazi party and the ‘Führer’ Adolf Hitler. The Catholic theologian Karl Adam would be one of the best examples of this error of German academics. Wolfe now tries to show that the engagement of Heidegger with the Nazis has to be understood from this strand of German nationalism, which was not identical with the racist and anti-Semitic ideology of the Nazis. It is interesting that Wolfe does not discuss the question whether Heidegger was anti-semitic or not, a question, which recently found new material for the debate after the publication of Heidegger's diaries, the so-called ‘black books’. It is possible that Judith Wolfe could not have read these new passages, which could be interpreted as anti-semitic, because they were published after she finished work on her book. But there are other statements of Heidegger, which have been well known for years, which already gave rise for the question if Heidegger was more involved in the anti-semitic ideology of the Nazis than his defenders tried to make us believe. With regards to the debate concerning theology after Auschwitz it would still be a vital question for a theological engagement with Heidegger and his work. But the main problem with Heidegger's own attitude to his commitment with the Third Reich remains his silence and his refusal to admit that he was wrong.

Judith Wolfe definitely sheds some new light on the development of Heidegger and even his participation in the Nazi movement, but with regards to this question the contextualization of his philosophy in the early 1930s does not explain all of his actions and statements in this particular time. There is still a field of debate and disagreement in the case of Heidegger and the Third Reich. But apart from this controversial point, Judith Wolfe shows in her substantial and comprehensive introduction to Heidegger that his philosophical work is still a challenge for contemporary theology and an important reference for theological questions. Not only because the history of philosophy in the 20^th century cannot be understood without the work of Heidegger, but also because this work was developed within a constant debate with the question of religion, especially Christian faith and the question of God. The insistence of Heidegger that the questions are more important than quick and easy answers should be a reminder to every theologian to be suspicious of too hermetical systems in theology. Judith Wolfe shows that especially the subject of eschatology remains a field of research, where theologians should get into a debate with the thoughts of Heidegger. For this coming research, the book by Judith Wolfe will be an indispensable source and guide for all theologians and philosophers who want a thorough and comprehensive introduction to Heidegger and theology.