#65 Does the vital principle reside in any one of the bodies known to us ?
“It has its source in the universal fluid; it is what you call the magnetic fluid, or the electric fluid, animalised. It is the intermediary, the link between spirit and matter.”
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So we may say that this vital principle, important element of the Universe, is what links the spirit to the body; so maybe when we feel very tired or very sick, we also lack of such fluid. Is dying then synonym of losing all this principal that keeps the body animalised by the willingness of the spirit?
we recommend this book for those who want to start practicing safely.
The Spirits' Book - Allan Kardec 