In 1888, as a result of his work for the Kürschner edition of Goethe's works, Steiner was invited to work as an editor at the Goethe archives in Weimar. Steiner remained with the archive until 1896. As well as the introductions for and commentaries to four volumes of Goethe's scientific writings, Steiner wrote two books about Goethe's philosophy: "The Theory of Knowledge Implicit in Goethe's World-Conception" (1886), which Steiner regarded as the epistemological foundation and justification for his later work, and "Goethe's Conception of the World" (1897). During this time he also collaborated in complete editions of the works of Arthur Schopenhauer and the writer Jean Paul and wrote numerous articles for various journals.