From Michael Newton's "Journey of Souls" book:
Dr. N: Perhaps you could give me some idea of what they [other worlds] are like?
S: Oh, some are ... analytical schools. Others are basically mental worlds ... subtle
places
Dr. N: What do you think of the Earth school by comparison?
S: The Earth school is insecure, still. It is filled with resentment of many people over
being led and antagonism of the leaders toward each other. There is so much fear to
overcome here. It is a world in conflict because there is too much diversity among
too many people. Other worlds have low populations with more harmony. Earth's
population has outpaced its mental development.