The author of this work is theologian, historian of the Russian church, church and public figure, Professor Anton Vladimirovich Kartashev (1875–1960). In 1919 he left Russia, becoming an active figure in the Russian emigration. There, in Paris in 1956, one of his main works on the history of the Russian Orthodox Church, the book “Reconstruction of Holy Rus',” was published. In this study, Kartashev notes that “The very faith in Holy Rus', the conviction that outside of it there are no saving paths for Russia - this is the main spiritual capital, without which we are nothing. But faith without works is dead. Creative faith requires not only contemplation, but also action. And action requires a plan, method, technique, organization and patient work.” The author outlines some plan for the upcoming activities for “returnees from the rivers of Babylon” to the shores of their fatherland, creating a fundamental ideological guide for those who want to go in this direction. Using the specific example of Russia, Kartashev examines the “delicate problem” of the relationship between the church and the state, putting forward his main thesis: “No one will do Holy Rus' for us if we don’t do it ourselves.”