Human lives occur on many levels. In Only Love is Real: A Story of Soulmates Reunited (1997), Psychiatrist Brian Weiss quotes one of the “Masters” as saying:
“Humans alway think of themselves as the only beings. This is not the case. There are many worlds and many dimensions… many, many more souls than there are physical containers. Also, the soul may split if it wishes and have more than one experience at the same time. This is possible but requires a level that most have not achieved. Eventually they will see that like as pyramid there is only one soul. And all experience is shared simultaneously. But this is not for now.
“When you look into the eyes of another, any other, and you see your own soul looking back at you, then you will know that you have reached another level of consciousness. In this sense reincarnation does not exist, for all lives and all experiences are simultaneous. But in the three-dimensional world, reincarnation is as real as time or as a mountain or as the oceans. It is an energy like other energies, and its reality depends on the energy of the perceiver. As long as the perceiver perceives a physical body and solid objects, reincarnation is real to that perceiver. The energy consists of light and love and knowledge. The application of this knowledge in a loving way is wisdom…. There is currently a great lack of wisdom on your plane.”
Whether reincarnation actually exists, or is really a way in which our mind conceives of something that we do not yet understand, remains a mystery. My own theory is that we are made up of fragments of the universal energy, just as as bodies are made of stardust.