29. By this emigration of spirits it is not necessary to understand that all undeveloped spirits will be expelled from Earth, and condemned to live in inferior worlds. Many, on the contrary, will return here – those who have yielded to temptation by the force of circumstances and example; those who appeared to be much worse than they really were. Once delivered from the influence of matter, and the prejudices of the corporeal world, the greater part of them will see things in an entirely different light than when living, as we have numerous examples of it. In this they are aided by benevolent spirits who are interested in them, and who try to enlighten them by showing them the wrong in the way they have pursued. By our prayers and exhortations we can ourselves contribute to their improvement, because there is a perpetual connection, an unbroken chain, between the dead and living.
The transformation is very simple, entirely a moral one, which is according to the laws of nature.