There are three categories-high , middle and low . Those who belong to the high category have vanity because they are superior to the other two types and they are envious of those who are of the same category.
  Similarly those of middle class are proud as they consider them superior to those of the low class and have a burning sensation having seen the superior heavenly luxuries of the high class .
  In the same way those of the low class are envious and jealous of the other two classes and they are proud when they think of those who have not attained heaven . Their residence in heaven is not permanent becaus3 they have to return to the world of mortals when their merits are exhausted and they remain worried after thinking of it.