This book is the companion to Difference and Disavowal: The Trauma of Eros (Stanford University Press, 2000), which dealt with the psychoanalytic clinical problem of resistance to interpretation. The key to this resistance is the unconscious registration and repudiation (disavowal) of the reality of difference. The surprising generality of this resistance intersects with Nietzsche's, Heidegger's, and Derrida's understanding of how and why difference is in general the "unthought of metaphysics." All three see metaphysics engaged with a "registration and repudiation of difference," and all three rethink interpretation in relation to this question. The synthesis of these theories of interpretation and difference provides the philosophical foundations for a new thinking of how interpretation functions, and is a critical intersection of deconstruction and psychoanalysis.