46. Without reincarnation the mission of Christ, as well as the promise made by God, would be useless. Let us suppose that the soul of man is created at the birth of his body and that it only once appears, and then disappears from the Earth. There is no relation between those who have come from Adam to Jesus, neither between those who have been born since; they are all strangers to one another. The promise of a Savior made by God could not only apply to the descendents of Adam if their souls were not yet created. In order that the mission of Christ should fulfill the divine word, it was necessary that it should be applied to the same souls. If these are new souls, they cannot be stained with the fault of the first father, who is only the material and not the spiritual parent; otherwise God must have created souls stained with sin they could not have committed. The common doctrine of original sin implies the necessity of a connection between the souls living on Earth in the days of Christ and those of the time of Adam, and consequently of reincarnation.
Suppose that all these souls formed a part of the colony who came to Earth in the days of Adam, and that they were stained with the sin which had expelled them from a brighter world, and you will find a rational interpretation of original sin, each individual’s own sin, and not the result of the fall of another, whom he has never known. Say that these spirits are reborn in different parts of the Earth into corporeal life, that they may progress and purify themselves; that Christ came to enlighten these same souls not only with reference to their past, but also with a view to their ulterior lives; and then only do you endow his mission with an object acceptable to reason.