Being and Time previous philosophies that had become entrenched and hidden within the theoretical attitude of the metaphysics of presence. This use of the word "Destruktion" is meant to signify not a negative operation but rather a positive transformation or recovery. In "Being and Time" Heidegger briefly undertakes a destructuring of the philosophy of René Descartes, but the second volume, which was intended to be a "Destruktion" of Western philosophy in all its stages, was never written. In later works Heidegger uses this approach to interpret the philosophies of Aristotle, Kant, Hegel, and Plato, among others. "Being and Time" is the major achievement
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