"Arbeit macht frei"

Theodor Eicke : Inspector of Camps, Nazi Party
Work Will Make You Free. Slogan of the Nazi concentration camps, often displayed at the entrances. The phrase, borrowed from an earlier German novel, was a false promise to the workers of the camps that they might have an opportunity to be freed on the basis of work performance.
Originally the title of a book by Lorenz Diefenbach in 1873 which described the way for sinful people to be absolved of their transgressions through labor.

Arbeit macht frei: Erzählung von Lorenz Diefenbach (novel), Lorenz Diefenbach, 1873