The world is now seen as something rational: It emerges from eternal reason, and this creative reason is the only true power over the world and in the world. Faith in the one God is the only thing that truly liberates the world and makes it "rational." When faith is absent, the world only appears to be more rational. In reality the indeterminable powers of chance now claim their due; "chaos theory" takes its place alongside insight into the rational structure of the universe, confronting man with obscurities that he cannot resolve and that set limits to the world's rationality. To "exorcise" the world--to establish it in the light of the ratio (reason) that comes from eternal creative reason and its saving goodness and refers back to it--that is a permanent, central task of the messengers of Jesus Christ.
--Pope Benedict XVI, Jesus of Nazareth--Part One: From the Baptism in the Jordan to the Transfiguration (New York: Doubleday, 2007), p. 174