The soul , being eternal, after death is like a caged bird that has been released. If it has been a long time in the body, and has become tame by many affairs and long habit, the soul will immediately take another body and once again become involved in the troubles of the world. The worst thing about old age is that the soul's memory of the other world grows dim, while at the same time its attachment to things of this world becomes so strong that the soul tends to retain the form that it had in the body. But that soul which remains only a short time within a body, until liberated by the higher powers, quickly recovers its fire and goes on to higher things. 
Psychologist Julian Jaynes proposed that this is a temporary accessing of the bicameral mind; that is, a temporary separating of functions, such that the authoritarian part of the mind seems to literally be speaking to the person as if a separate (and external) voice. Jaynes posits that the gods heard as voices in the head were and are organizations of the central nervous system. God speaking through man, according to Jaynes, is a more recent vestige of God speaking to man; the product of a more integrated higher self. When the bicameral mind speaks, there is no introspection. We simply experience the Lord telling us what to do. In earlier times, posits Jaynes, there was additionally a visual component, now lost.