Pavel Florensky--certainly the greatest Russian theologian of the last century--is now recognized as one of Russia's greatest polymaths. Known as the Russian Leonardo da Vinci, he became a Russian Orthodox priest in 1911, while remaining deeply involved with the cultural, artistic, and scientific developments of his time. Arrested briefly by the Soviets in 1928, he returned to his scholarly activities until 1933, when he was sentenced to ten years of corrective labor in Siberia. There he continued his scientific work and ministered to his fellow prisoners until his death four years later....