15. It could be said then, that evil is necessary and that it will last forever, seeing that if it disappears God would be deprived of a powerful means of being able to correct the guilty. It could also be said that it is useless to try to better mankind. However, if we ceased to have culprits then it would be unnecessary to have any kind of punishment.
Let us suppose that mankind was transformed, so becoming composed only of good men and women, then no one would think of doing evil to his neighbour and all would be happy to be good. This is the condition found in the elevated worlds, where evil has been banished. This is what will come to pass here on Earth, when Man has made sufficient progress. But new worlds are populated by primitive Spirits and also serve as places of exile, places of atonement, for those Spirits who are imperfect, rebellious, persistent in evil or who have been expelled from worlds which have become places of happiness.