‘Heidegger's Philosophy’ lays out the significance of, and the questions raised by, Heidegger's masterwork, Being and Time. The result of his reading, lecturing and thinking over the previous decade, it points the way ahead to his later works, which cannot be understood independently of it. Being and Time is also one of the most difficult books ever written. The work addresses how humans can ask the question ‘What is being?’ and the temporal nature of the human being (Dasein). The importance of the question, its relation to Dasein, and the proposed message of the omitted sections of the work are all subjects for discussion.