How do spiritual communications arrive?

Most spiritual communications that reach you arrive from earthbound spirits and spirits of the first spiritual zone.

This is due entirely to the Law of Vibratory Correspondence. That law requires that in order for two organisms to respond to each other, they must vibrate at the same rate. In other words, they must be keyed to the same number of vibrations per second—must be in tune with each other.

The reason that spiritual knowledge, arriving from the first spiritual zone is unsatisfactory, and tells you nothing—or next to nothing of the spiritual world is due to the fact that the spirits of the first spiritual zone have not in a sense entered the spiritual world, but are merely preparing to enter, and are, therefore, in no position to tell you anything of the spiritual world.

The only precise knowledge of the spiritual world that is reaching you is arriving from higher spiritual zones, and is being received by a few masters and seers who have attained in human form to a remarkably high state of spiritual development. 

Most, if not all, of the communications received from the first spiritual zone have to do with the establishing of identity, and with the consolation of, and the suggestion of things to the spirits that are still in human form.

Fragments of Spiritual Knowledge Pertaining to the Spiritual World