This volume’s first entry is the 1955 address “What is that— philosophy?” Given the question’s Greek origin, Heidegger makes it into a conversation with the Greeks, tracing the dominant conception of philosophy to Aristotle’s metaphysics while also suggesting a positive sense of philosophy as attuned correspondence to the being of beings. The second entry contains two addresses first published together in 1957 as Identity and Difference: “The Principle of Identity” and “The Onto-Theo-Logical Constitution of Metaphysics.” In the former Heidegger links his conception of the identity of being and thinking in the Ereignis with a reading of Parmenides, in stark contrast to German idealism’s interpretation of identity as a self-mediating unity; in the latter he contrasts his conception of difference with Hegel’s absolute concept as well as the standards and characters of their conversations with the history of thinking. The volume also contains the published version of the 1949 Bremen lecture “The Turn” and the 1957 Freiburg address “Basic Principles of Thinking,” both in versions slightly revised for their initial publications a few years later as well as letters to William Richardson (1962) and Takehiko Kojima (1973).