At the same time Adorno struck up relationships with contemporary German-language poets such as Paul Celan and Ingeborg Bachmann. Adorno's 1949 dictum—"To write poetry after Auschwitz is barbaric"—posed the question of what German culture could mean after Auschwitz; his own continual revision of this dictum—in "Negative Dialectics", for example, he wrote that "Perennial suffering has as much right to expression as a tortured man has to scream"; while in "Commitment," he wrote in 1962 that the dictum "expresses in negative form the impulse which inspires committed literature"—was part of post-war Germany's struggle with history and culture. Adorno additionally befriended the writer and poet Hans Magnus Enzensberger as well as the film-maker Alexander Kluge.