The author of the 3-volume work, In the Light of Truth: The Grail Message is German, and was born in 1875 in Bischofswerda near Dresden (Saxony). His civil name is Oskar Ernst Bernhardt. Under the name Abd-ru-shin he wrote and published the lectures of his Grail Message. He completed his education as a businessman, and in 1897 established a trading company in Dresden. After 1900, he frequently traveled throughout the world, writing his impressions in novels and plays. At the beginning of the First World War, the traveler was interned in England, and imprisoned on the Isle of Man until the end of the war. It was during these years that he experienced the inner need of many people, and the wish awaked in him to help humanity.
After his release from internment in 1919, he returned to Dresden. He resumed his literary activity, and began, in 1923, to write and publicize the first lectures of the Grail Message. In 1924, he moved to Upper Bavaria, and settled in Vomperberg, Austria in 1928 (where he completed his major work, In the Light of Truth: The Grail Message.) When Nazi Germany annexed Austria in March of 1938, his property was expropriated, and he himself was expelled.
The last years of his life (Abd-ru-shin died early in December, 1941) were spent under surveillance of the Gestapo in Kipsdorf (Erzgebirge). He utilized this period of isolation to revise and edit the Grail Message. After the end of the war and the return of his property through the Allies to his widow, a tomb was erected for Abd-ru-shin on Vomperberg.