‘Heidegger’s philosophy’ lays out the significance of, and the questions raised by, Heidegger’s masterwork, Being and Time, which was published in 1927. 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). A proposed third section of Being and Time considering the question of Being and its relation to time, in greater independence of Dasein, was omitted.