Sorry, I realise I'm at risk of derailing this nascent thread, but I'm genuinely curious - these 'new' souls projected this central repository, are they totally new creations, are they some sort of amalgamation of previous souls? Is this 'Universal Spirit' the thing that souls are returning to when they achieve Nirvana? And if they're not returning, could this 'Universal Spirit' run out?
Again, I appreciate there may not be a definitive answer on this, but I don't get the opportunity to speak with people with a background in this culture too often.
O.
These are only speculative ideas. No one has any clear idea about this. But Hinduism fortunately, doesn't accept any idea merely through scripture. In fact there is nothing that you can call 'scripture' or anything unquestionably true. People are free to come up with their ideas any time and it will be accepted as a part of Hindu philosophy. If science comes up with any meaningful ideas, that will be accepted too.
The Universal Spirit is believed to be pure spirit and the source of the universe. How and why....we don't know. Creation is believed to happen through vibrations in the cosmic consciousness and happens in various levels (7 levels in some texts). The Universal Spirit or Consciousness is believed to descend through these levels and lodge itself into the material world as individual souls. These souls then ascend back through the different levels to join the Universal Consciousness. This happens through a learning and cleaning process.
When water evaporates from the ocean does it contain water from the different rivers. Yes of course, it does...but it cannot be identified with any specific drop of water that comes in. The Universal Spirit is not a box full of souls that it can 'run out'. It is the universal itself. It is all that exists. The universe and our individual consciousness exist within this Spirit.
These ideas are similar to Kabbala also btw.