In 1910 Kraft, already interested in German literature and bibliophile, discovered the work of two contemporary writers; Rudolf Borchardt and Karl Kraus.
Lessing also mediated Kraft's first publication in the journal Die Aktion, edited by Franz Pfemfert, a review of Rudolf Borchardt's poem Wannsee and Stefan George's poetry book Der Stern des Bundes.
For half a year he tried his hand at an apprenticeship as a banker at Dresdner Bank in Hanover, whose director Julius L. Isenstein (1856–1929) was a relative on his mother's side.
In Berlin he also made friends with Walter Benjamin and Gerhard (Gershom) Scholem and first met the writer Borchardt, whom he admired.
His friendship with Lessing and reading the magazine Die Fackel by the Viennese satirist Karl Kraus as well as the books by Borchardt.