Sergii Bulgakov considered the problem of the relationship between faith and reason, including scientific knowledge, in a number of works, especially in Philosophy of Economy: The World as Household (1912), in Unfading Light: Contemplations and Speculations (1917), in his so called great trilogy—The Lamb of God (1933), The Comforter (1936), and The Bride of the Lamb (1945)—and above all in his succinct essay “Religion and Science” (1919).