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.