Valentin Tomberg was for many years a strong proponent of Rudolf Steiner's spiritual science. He became a prominent lecturer and writer on anthroposophy--then, in 1945, he turned away from anthroposophy and converted to Roman Catholicism, subsequently authoring two influential texts on Catholicism. Nevertheless, a number of Tomberg's modern-day adherents maintain that he remained faithful to esoteric Christianity and to Rudolf Steiner's ideas. Prokofieff...