What is the spiritual part of the human being?

There are zones in the physical human world, as well as in the spiritual world, and each of these zones is set off from the others by boundary lines that are invisible.

The boundary lines of each of these physical human zones are composed of human experience, knowledge, perception, grasp—spiritual, physical and mental development, and many other things besides.

Some human spirits spend all of one lifetime within the boundaries of one of these physical human zones, while other spirits traverse in one lifetime all of the physical human zones, and arrive at death at a point in their development from which it will not be necessary for them to return again in human form to the physical material world.

Each species of life represents a zone, and each zone is divided into a number of other zones, representing the different stages of development of the life of that species.

Fragments of Spiritual Knowledge Pertaining to the Spiritual World