30. Allowing that the spirits of the new generation are new ones, but better, more advanced than the preceding ones, or ancient developed spirits, the result is the same. From the instant that they become inspired by better desires, the renovation takes place. There are then two categories of incarnated spirits, which are formed according to their natural dispositions – on one side those tardy in progression who depart, and on the other the progressive ones who arrive. The condition of society in a nation or in the entire world will be according to the preponderance which one of these two categories has over the other.