"In its resistance to the great attack on traditional dogma launched by the Enlightenment, the Protestant theology of the 19th century … had very largely agreed in taking up a defensive position in which the truth of Christian faith was to be proved by demonstrating the indispensability of religious feeling to all higher humanity. … Yet on this basis it was not possible to refute the contention of Ludwig Feuerbach that the secret of theology is anthropology. … The secret of God was in truth that of self-glorifying man speaking of God and extolling his own divinity."