What is the realm of darkness?

Many who were great upon earth find themselves very small in spirit. 

And many who were unknown upon earth find themselves here so spiritually well-known as to be almost overcome by it. 

It is not all who are destined for the beautiful realms of eternal sunshine and summer.

There are realms of darkness and semi-darkness where all is cold and bleak and barren and wherein souls have their abode, souls who can rise up out of the darkness if they so wish it and will work for that end. 

There are many who spend their heaven visiting these dim regions to try to draw out of their misery some of these unfortunates and to set them upon the path of light and spiritual progression.