Kant and the Problem of Metaphysics Kant and the Problem of Metaphysics Kant and the Problem of Metaphysics () is a 1929 book about Immanuel Kant by the German philosopher Martin Heidegger. It is often referred by Heidegger to simply as the "Kantbuch" ("Kantbook"). This book published as volume 3 of the "Gesamtausgabe". The book is dedicated to the memory of Max Scheler. During the 1920s Heidegger read Immanuel Kant extensively. The Kantian influence is pervasive throughout Heidegger's most celebrated and influential book, "Being and Time" (1927). The Kantbook can be seen as a supplement for the unfinished second part of "Being and Time". Additionally, during
Being in itself 'Being in itself' to be at the same time the most vague and general concept possible to contemplate, but also the topic of greatest interest to him as a philosopher. In Sartrean existentialism, being-in-itself ("être-en-soi") is also contrasted with the being of persons, which he describes as a combination of, or vacillation or tension between, being-for-itself ("être-pour-soi") and being-for-others ("I'être-pour-autrui"). Being-in-itself refers to objects in the external world — a mode of existence that simply is. It is not conscious so it is neither active nor passive and harbors no potentiality for transcendence. This mode of being is relevant to