1722-1794 1824-1871 1853-1900 1871-1944 197 19thcentury 20thcentury biography bulgakov censorship doctrines doctrinesorthodoxeasternchurch feodor grigoriisaavich history historyrusskai͡apravoslavnai͡at͡serkovʹ hryhoriĭsavych intellectuallife matter mystics russia russianculture sergiĭ sergiĭ skovoroda soloviev sovietunion spirit theologians theology to1970 vladimirsergeevich vladimirsergeyevich