The earliest dogma held by the apostles concerning Jesus was that of his resurrection from the grave after death. It was not only the earliest, but the most essential to the success of the new religion. Christianity might have overspread the Roman Empire, and maintained its hold upon men's faith until to-day, without the dogmas of the incarnation and the Trinity; but without the dogma of the resurrection it would probably have failed at the very outset. Its lofty morality would not alone have sufficed to insure its success. For what men needed then, as indeed they still need, and will always need, was not merely a rule of life and a mirror to the heart, but also a comprehensive and satisfactory theory of things, a philosophy or theosophy. The times demanded intellectual as well as moral consolation; and the disintegration of ancient theologies needed to be repaired, that the new ethical impulse imparted by Christianity might rest upon a plausible speculative basis. The doctrine of the resurrection was but the beginning of a series of speculative innovations which prepared the way for the new religion to emancipate itself from Judaism, and achieve the conquest of the Empire. Even the faith of the apostles in the speedy return of their master the Messiah must have somewhat lost ground, had it not been supported by their belief in his resurrection from the grave and his consequent transfer from Sheol, the gloomy land of shadows, to the regions above the sky. The origin of the dogma of the resurrection cannot be determined with certainty. The question has, during the past century, been the subject of much discussion, upon which it is not necessary for us here to comment. Such apparent evidence as there is in favour of the old theory of Jesus' natural recovery from the effects of the crucifixion may be found in Salvador's "Jesus-Christ et sa Doctrine"; but, as Zeller has shown, the theory is utterly unsatisfactory. The natural return of Jesus to his disciples never could have given rise to the notion of his resurrection, since the natural explanation would have been the more obvious one; besides which, if we were to adopt this hypothesis, we should be obliged to account for the fact that the historic career of Jesus ends with the crucifixion. The most probable explanation, on the whole, is the one suggested by the accounts in the gospels, that the dogma of the resurrection is due originally to the excited imagination of Mary of Magdala. [23] The testimony of Paul may also be cited in favour of this view, since he always alludes to earlier Christophanies in just the same language which he uses in describing his own vision on the road to Damascus. [23] See Taine, De l'Intelligence, II. 192.