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The soul is a spiritual body, the spirit is the spark of self, of light, it is what we are. Check my sig for a link to learn more. The soul is all that we've acquired through evolution via reincarnations. The soul can be destroyed in hell or replaced by a superior soul through the practice of tantra (born again christian, baptism). The spirit is the animation of the soul, the life which is our true nature. The soul is our vehicle, and houses our capacity for intellect and emotion. (the bible says the mind is the seat of the soul) The spirit belongs to god. Even if one goes to hell (in the circle of eternity) the soul eventually dies, but we (the spirit) will eventually be free. After which we begin to evolve a new soul through the mineral, plant, animal, and human kingdoms. Think of an egg, the yoke is the spirit, and the white is the soul.

When we speak of soul dying I think we have to make clear that it is figure of speech, because a soul cannot die or be destroyed in the same way physical objects die. A soul can probably change, and this is what is meant by dying, a change from one form to another form (but this is also an inaccurate statement, because how do we know that a soul has form?). In order for a soul to truly die, it has to be alive in the first place, and in the non-physical dimension, there is no distinction between alive and dead, at least none that will make any sense to us physical beings. Also, when you say spirit is the spark of light, you must clarify that this is not literally true, otherwise, we can use spirit as free electricity by these statements: 1. spirit cannot be destroyed (used up) 2. spirit can create energy therefore, spirit can create infinite electricity. Of course, if it is literaly true, then we should build a device that can make this happen, and solve all energy needs.

You are saying the soul exists here in the physical, natural dimension, but this does not seem to be the case. The expression "lose the soul" means to lose mental contact with ethics and morality. Before, people thought this resides in the soul in the non-physical world. But nowadays, we know that you can generate ethics and morality in the physical brain as a mechanical process, so when you say "lose the soul" you are not talking about the soul which resides in the non-physical world, but a disconnection to the mechanical process in your brain. If we can demonstrate that soul exists here in physical world, this is a supernatural thing (by the current definition of nature), and we can win $1million from the Randi challenge. There are many strange case of seeming past-lives, but they are not very good as proof because you can learn or guess things from the past. There are many strange case of out-of-body experience, but that is no good either, because they cannot be done on command. One easy method is to communicate with the future soul incarnation, who has knowledge of the future. (If we have past lives, then it is reasonable to say we have future lives too, and that communication can go both ways.) Then the future soul can tell us, for example, the order of a shuffled deck. This is a simple testable way to win the Randi challenge.

Re:
When I say ethics and morality, I don't mean the concepts or spirits of ethics and morality, I mean the actual mechanical process, which can be reproduced in even other animals such as lower primates. It may even be that this can be mechanized in a non-thinking system, the same way you can build a machine to draw water from the ground, you can perhaps make a machine to generate ethical and moral actions, but this is an exercise for morality experts. Before, we did not understand that ethical and moral actions are decided by a physical process, and also we did not understand that other animals can do it as well. So in the past, sometimes we make the following mistakes: 1. soul = source of moral and ethics 2. only humans can have souls But now we know that soul is not responsible for this, and that everything has a possible soul, even inanimate matter. If you can access the soul-dimension through lucid dreaming, then you can potentially access the future, or do remote viewing. These are supernatural abilities, which can be tested by simple card deck test. I have not heard of anyone being able to do this reliably, so it must be quite rare to be able to access the non-physical dimension at will.