Allan Kardec. The book of spirits (№ 396004)

Question: a Man belonging to a civilized people, can he, as an atonement, to be embodied in people wild?
Answer: Yes, but it depends on the kind of his atonement; the owner, who was cruel to his slaves, may in turn become a slave and experience the full brunt of ill-treatment, he was forced to undergo others. It is his atonement, if he abused his power, and God can it to this oblige. The spirit of kindness, in order to encourage the promotion of backward peoples, also can choose their own existence, able to influence them to promote their development, and then it is a special purpose mission.