The expression comes from the title of a novel by German philologist Lorenz Diefenbach, Arbeit macht frei: Erzählung von Lorenz Diefenbach (1873), in which gamblers and fraudsters find the path to virtue through labour.
Georg Anton Lorenz Diefenbach (19 July 1806, Ostheim, Landgraviate of Hesse-Darmstadt – 28 March 1883, Darmstadt) was a German philologist and lexicographer, as well as a novelist associated with the German Nationalist movement.
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