The practice presented in the book helps the birth of the spiritual body, the awakening of that part of oneself that is free from surrounding circumstances and karmic conditioning. The birth of the spirit is not a metaphor. This is the real process of turning energy into a thin body. The newborn spirit matures according to your energy abilities. If you were to die, then the energy gathered in the spiritual body would not just dissipate. Initial practices lead to the first steps to overcome reincarnation.