How can we live? What drives us? How can I exist relating to another?
All these questions help defining soul. The soul is that animates a body, which makes it alive, which makes it one. Indeed, life can not exist without something that animates material. The soul is that makes us grow.
The soul is the fact that everyone exists in the universe, or another universe, in relation to others. The soul makes it possible to prove that the universe exists. It makes us living, that our mind thinks we exist. Every soul makes a living being.
It is thought that the soul makes our body living. In fact, Luc Montagnier, the discoverer of the AIDS virus, says that the coherent water of every living body is animated with microphones and nanowaves. Thus, Luc Montagnier was able to recreate genetic material from a simple MP3 player, obviously using cell's elements. He recreated the waves that our soul produces.
That is certain is that the soul orders. It is possible that it creates time. The soul is touching God. That is, it gives us ideas about our questions and our links. The soul organizes plants and living things. Animals and humans have a sensitive soul, capable of consciousness. Humans have a soul capable to create something new, so it is noetic. The creative reason is the human.
The universe needed souls to prove that it existed. God has a soul that is in his universe. Indeed Lourdes' miracles or those of some recent prophets are unbelievable, for the doctors whom knew them. Jesus explained that fair souls will join God, or his paradise, where there is no notion of time gap. The human soul is called to be the equal of God, after judgment. The animal soul is abandoned as was the human soul on prehistory.
Egyptians believed in the journey after death.
According to the multiverse theory, another universe should act on ours with souls, with gravity too. The soul is a creation of the universe. That is driving us comes from another universe.
My Notes
Understanding the soul is a truth's research. Nobody thinks that one soul can replace another. Try to imagine that should happen if that were the case. Write on the soul then.