With these words Heidegger closes his 1927/28 lecture course on Kant's Critique of Pure Reason. They reveal a lot about Heidegger's work on Kant. Heidegger experienced in Kant the same philosophical originality and insight that makes Being and Time such an enduringly important book. Indeed, Heidegger implies here that he sees substantial overlap between his own work and Kant's. When Heidegger publishes his interpretation of Kant, commentators condemn this overlap. They claim that Heidegger's interpretation distorts Kant and buries his transcendental philosophy under a mound of Heideggerian views. The aging Heidegger himself feels compelled to issue a retraction in a late preface to his Kant and the Problem of Metaphysics, claiming – with uncharacteristic modesty, and falsely, as it turns out – that he had forced too much of his own thought onto Kant, subjecting the Critique to a reading whose basic terms are foreign to it. This presumption endures, but it is mistaken. Heidegger's Kant-interpretation is important, and it is so deeply intertwined with the existential phenomenology of Being and Time that it is impossible to understand one without the other.