Emanuel Swedenborg (1688–1772) inspired Andrew Jackson Davis (1826–1910), in his major work The Great Harmonia, to say that Summerland is the pinnacle of human spiritual achievement in the afterlife; that is, it is the highest level, or 'sphere', of the afterlife we can hope to enter. Summerland was a secular concept, which was appealing to some non-religious spiritualists.[3]
Neo-Theosophy
In Neo-Theosophy, the term "Summerland" is used without the definite article "the". Summerland, also called the Astral plane Heaven, is depicted as where souls who have been good in their previous lives go between incarnations.
Neo-Theosophists also believe [citation needed] there is another higher level of heaven called Devachan, also called the Mental plane Heaven, which some but not all souls reach between incarnations — only those souls that are more highly developed spiritually reach this level, i.e., those souls that are at the first, second, and third levels of initiation.
The final permanent eternal afterlife heaven to which Neo-Theosophists believe [citation needed] most people will go millions or billions of years in the future, after our cycle of reincarnations in this Round is over, is called Nirvana, and is located beyond this physical Cosmos. In order to attain Nirvana, it is necessary to have attained the fourth level of initiation or higher, meaning one is an arhat and thus no longer needs to reincarnate.
C.W. Leadbeater, a Theosophist, also taught that those who were good in their previous earthly incarnation went to a place called Summerland between incarnations.[4]