What is the evolution of consciousness?

All life is Spirit. 

And the life that is in man is a childlife—is a life that is still in the infant or childhood period of its development. 

Though this life that is in man has been in course of evolution from the remotest period of time, yet it has only obtained in the most highly developed—in those who are about to depart this life to return in physical form no more—a state of development that corresponds to the physical life of a child of seven to eleven years of age.

There are no matured spirits in human form—no spirits that have attained to maturity either in this world, nor in the first spiritual zone. 

The minute that a spirit has reached a spiritual development where a physically constructed body and intellect are no longer necessary to its development, it is transferred to the spiritual world.

Fragments of Spiritual Knowledge Pertaining to the Spiritual World