Abd-ru-shin (Abd-ru-shin or Abdruschin) is the pseudonym of Oskar Ernst Bernhardt (German: Oskar Ernst Bernhardt; April 18, 1875, Bischofswerda, Germany - December 6, 1941, Kipsdorf, Germany) - German writer and philosopher , author of works devoted to religious and philosophical themes and combined into the work “In the Light of Truth. The Message of the Grail" (German: 'Im Lichte der Wahrheit. Gralsbotschaft').

This book will disturb the peace of a wide range of readers, prompting each of them to make the most important decision in their lives. For this message bursts into the present age like a trumpet - the logic of its ideas is impartial, firm and inexorable. It gives the answer to the damned questions of human existence in all its fullness. The knowledge taught in this book is so enormous that it will make the open-minded reader think, weigh and move forward. Many who have been eking out a plant existence until now, without interfering in any way with the course of events, will be afraid - it may have seemed to them that it was impossible to change anything anyway. Horror seizes them at the thought of what they have missed; and - it would seem - forever. But the one in whom the spark of good intentions glimmers will find in this Message a guiding thread for the joyful Cognition of New, Clear Paths in the Total Creation. In amazement, a person realizes how extraordinarily significant his existence is in this Creation and what Power, the existence of which he did not even suspect, is at his disposal - the all-crushing effect of this Power will strike him if he cannot correctly use It, directing It for the Good . For anyone who is not afraid to tear the veils off the still unsolved mysteries of life, this book will bring incomparable, enormous benefits. It will appear to the reader as the life-giving Message of the Grail.