Iain Thomson

When Kant finished the Critique of Pure Reason in 1781, he was 56 years old and had already published more than 25 essays and monographs. In this precritical oeuvre the young Kant unabashedly answered some of the most difficult questions of theoretical physics, physical geography, cosmology, theology, and moral theory, advancing ambitious theories about the origin and history of the universe, the nature of space, the age of the earth and the stability of its rotation, the causes of earthquakes, winds, and fire, the ultimate components of reality, the soundness of optimism, the legitimate domain of logic, the character of the beautiful and the sublime, the first principles of theology and morality, the possibility of proving God’s existence, and—tellingly, at the end—the connection between metaphysics and madness. Since this dizzying speculative array appears to be unified only by the young Kant’s “metaphysical exuberance”, his precritical thought is often dismissed as the work of an unfocused dilettante.

Martin Heidegger is now widely recognized as the most influential philosopher of the Twentieth Century. Until the late 1960's, this impact derived mainly from his early magnum opus, 1927's Being and Time. Many of this century's most significant Continental thinkers---including Sartre, Merleau-Ponty, Arendt, Gadamer, Marcuse, Habermas, Bultmann, and Levinas---acknowledge profound conceptual debts to insights first elaborated in this text. But Being and Time was never finished, and Heidegger continued to extend, develop, and in some places revolutionize his own thinking for another fifty years. This "later" Heidegger's prolific body of work has decisively influenced the next generation of Continental thinkers, shaping the concepts and concerns of important figures such as Derrida, Foucault, Lacan, Blanchot, and Baudrillard. Despite this unparalleled impact, several basic aspects of Heidegger's later philosophy remain shrouded in mystery, confusion, and controversy. ;The End of Onto-Theology: Understanding Heidegger's Turn, Method, and Politics explains four central aspects of Heidegger's later thought: his controversial understanding of metaphysics as onto-theology, his famously recondite Kehre, his heretofore overlooked philosophical methodology, and his appalling misadventure with Nazism. ;Chapter I introduces the basic structure and unifying thesis of the text. Chapter II clarifies and periodizes Heidegger's mysterious Kehre or "turn," the philosophical transformation which distinguishes his "early" and "later" work. Chapter III uncovers another sense of Kehre, connecting this "turning" to Heidegger's infamous political misadventure. Chapter IV reconstructs Heidegger's famous Destruktion of the history of metaphysical foundationalism, showing how this "deconstruction" both disabused Heidegger of his own politically disastrous metaphysical ambition to recover a "fundamental ontology" and provides the necessary philosophical background for understanding Heidegger's later philosophy. Chapter V explicates Heidegger's later methodology, "ontohistorical placement through hermeneutic altercation," using the case of Nietzsche to demonstrate how Heidegger developed and deployed this method to situate other philosophers' contributions to the history of intelligibility. Chapter VI addresses the complex intersection of Heidegger's critique of Nietzsche's nihilistic legacy with his failed bid to assume philosophical leadership of the National Socialist "revolution," isolating its philosophical sources and establishing the important philosophical lessons Heidegger learned from his "great political error."