User blog comment:Mohrpheus/Spiritual Imbalance in Bleach - The End of the World?!/@comment-44061-20100830232425/@comment-1268838-20100830235858

I had thought about that, but that's where I started to get confused. We know that souls reincarnate, so is every human in the world a reincarnation of a person that had previously passed on into Soul Society? If so, then that would mean that the grand total of souls in existence, Human or Hollow, remains a constant, meaning that we wouldn't take into the total number of people that have ever existed, since we're only looking at the number of souls. If not, then that means that souls can be born from nothing, which asides from artificial souls, we have no evidence that this happens in the Bleach universe.

But then again, perhaps the cycle between the Human world and Soul Society can remain balanced even when the total number of souls is gradually being reduced by Hollows. I am just confusing myself with the mathematics again.