A knowledge of the influences which ruled the life of Lincoln, the greatest of practical mystics, is essential now that a new form of paganism and slavery threatens humanity. In Lincoln's time the black slaves of America had to be freed; in our time the white slaves of Europe have to be freed. We have returned to the conquest. History is being repeated, but on a far vaster scale. The whole world is groaning under the threats and deeds of tyranny that seeks to become absolute.