Being and Time philosophy, and Heidegger's achievements in the work have been compared to those of Immanuel Kant in the "Critique of Pure Reason" (1781) and Georg Wilhelm Friedrich Hegel in "The Phenomenology of Spirit" (1807) and "Science of Logic" (1812–1816). The work influenced philosophical treatises such as Jean-Paul Sartre's "Being and Nothingness" (1943). "Sein und Zeit" was first translated into English in 1962. According to Heidegger's statement in "Being and Time", the work was made possible by his study of Husserl's "Logical Investigations" (1900-1901). "Being and Time" was originally intended to consist of two major parts, each part consisting of three divisions.
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