What is called thinking? Martin Heidegger, perhaps the most influential existentialist philosopher of our time, seeks out the essential nature of the process of thinking. The theme of this book is that we learn to think only as we inquire into those matters that normally remain unquestioned concerning our everyday existence and our traditions. Heidegger begins by pointing out that we come to know what it means to think when we ourselves try to think. Heidegger's aim is to make his readers more thoughtful, to teach them to do their own thinking. Informal and readable, this is one of the most lucid of the eminent philosopher's works.