I believe the Keeper of the Door is your spirit guardian, who walks with you and will remain with you throughout your chosen life journey on earth; to watch over you and protect you and oversee your development and progress through your physical journey. The keeper of the door will observe and study your intentions, actions and the choices you make. It is they who hold the lifeline for you and hold the keys for you to return to the realms of spirit, back to your divine self. They are not Spirit Guides and Angels; they are guardians, gate keepers and guiding lights. When a spirit decides to reincarnate and take an earthly life, it is my belief that your spirit and the keeper of the door is attached by an etheric cord. This etheric attachment keeps you safe from alien spirits. For example: Astral Travel. When your spirit leaves your physical body the keeper of the door is there to protect you from any spirit seeking a physical vehicle in order to take on an earthly existence for some purpose or other.
Keepers of the Door have had physical lifetimes as you have; therefore they understand and will embrace the knowledge and wisdom brought from those lifetimes to aid you in yours.