Why do those spirits remain there?

The scenery is more beautiful and their homes more attractive—there all the pleasures and benefits to be enjoyed by refined and delicate natures may be found.

Spirits remain there because it is their will to do so—

It is near the earth to which many of them cling with the deepest affection while others who have outgrown the attraction that once held them prefer to remain and acquire the knowledge and experience they should have gained on earth.