It is an interesting piece of writing in which the author describes the dual condition of our mind. In one aspect, there is the life we are living, and in another, there is a second aspect that we lived before. The author tells us how certain conditions from actual life can come to us, remembering the life we had before. There is a portal between the parallel worlds, and under special conditions, we can cross it. The author describes an accident, from a normal man who could cross the portal and remember when he was living in Mexico like an indian and how he was sacrificed by aztecas indians..