Mazzino Montinari and Giorgio Colli have called "The Will to Power" a "historic forgery" artificially assembled by Nietzsche's sister and Köselitz/Gast. Although Nietzsche had in 1886 announced (at the end of "On the Genealogy of Morals") a new work with the title, "The Will to Power: An Attempt at a Revaluation of All Values", the project under this title was set aside and some of its draft materials used to compose "The Twilight of the Idols" and "The Antichrist" (both written in 1888); the latter was for a time represented as the first part of a new four-part magnum opus, which inherited the subtitle "Revaluation of All Values" from the earlier project as its new title. Although Elisabeth Förster called "The Will to Power" Nietzsche's unedited "magnum opus", in light of Nietzsche's collapse, his intentions for the material he had not by that time put to use in "The Twilight of the Idols" and "The Antichrist" are simply unknowable. So "The Will to Power" was not a text completed by Nietzsche, but rather an anthology of selections from his notebooks misrepresented as if it were something more. Nevertheless, the concept remains, and has, since the reading of Karl Löwith, been identified as a key component of Nietzsche's philosophy although many believe so erroneously, so much so that Heidegger, under Löwith's influence, considered it to form, with the "thought of the eternal recurrence", the basis of his thought.