32. Progress has not then been uniform among all the human species. The most intelligent races have naturally advanced before others, without counting Spirits newly born into the spiritual life who, having come to incarnate themselves on Earth among the first arrivals, render the differences in progress more sensible. It would be impossible, indeed, to give the same antiquity of creation to savages, scarcely distinct from monkeys, as to the Chinese, and still less to civilized Europeans.
These spirits of savages however belong also to humanity. They will attain some day the level of their elders; but this will certainly not be in the bodies of the same physical race, improper to certain intellectual and moral development. When the instrument will no more be en rapport with their development, they will emigrate from this place, in order to incarnate themselves in one of a superior character, and so on in succession until they have conquered all the terrestrial grades; after which they will quit the Earth to pass into worlds more and more advanced. (“Revue Spirite,” April, 1862, p. 97: “Perfection of the Black Race”).