transmigration by Rampa

...
In the days of long ago, in fact long before recorded history began, giants walked upon the Earth. They were the Gardeners of the Earth, those who came to supervise the development of life on this planet, because we are not the first Round of Existence here, but like gardeners clearing a plot of land - all life had been removed and then we, the human race, had been left here to make our own way, to make our own development.

The Race of Giants were not very suitable for life on Earth, and so by magical means the Race of Giants shrank until they were the same size as humans, thus they were able to mingle with humans without being recognised as the Gardeners. But it was often necessary for a different senior Gardener to come and carry out special tasks, it took too long to have a boy born to a woman and then wait out the years of his babyhood and childhood and teenage. So the science of the Gardeners of the Earth had a different system; they grew certain bodies and made sure that those bodies would be compatible with the spirit who would later inhabit them.

The Gardeners of the Earth permitted certain men and women to mate so that a child was born to each, and the growth of that child would be most carefully supervised throughout, perhaps, the first fifteen or twenty or thirty years of life. Then there would come a time when a highly placed Gardener would need to come to Earth within a matter of hours, so helpers would place the trained body into a trance, into stasis , or, if you like, into a state of suspended animation. Helpers in the astral world would come to the living body, together with the entity who wanted to go to Earth, with their special knowledge they could detach the Silver Cord and connect in its place the Silver Cord of the entity who was the Gardener of the Earth coming to the Earth. The host would then become the vehicle of the Gardener of the Earth, and the astral body of the host would go away to the astral world just as he would do in the in the case of a person who had died...

...Many people think they can get in touch with those who have 'passed over' by going to a medium. Well, try telephoning Spain from Canada! Try telephoning England from Uruguay!! First you have the difficulty that telephone operator on Earth, or the medium, is not familiar with the circumstances. And then there are all sorts of hisses, clicks, and clunks on the wire, reception may be difficult, reception, in fact, is often impossible. Yet here on Earth we know the telephone number we desire to call, but who is going to tell you the telephone number of a person who recently left the Earth and now lives in the astral world? A telephone number in the astral world? Well, near enough, because every person has a personal frequency, a personal wavelength. In just the same way as the B.B.C. radio stations, or Voice of America, have their own frequencies, so do people have frequencies, and if we know those frequencies - we can tune-in to the radio station - PROVIDED atmospheric conditions are suitable, the time of the day is correct, and the station is actually broadcasting. It is not possible to tune-in and be infallibly sure that you can receive a station - for the simple reason that something may have put them out of action.

It is the same with people who have passed beyond this life. You may be able to get in touch with them if you know their basic personal frequency, and if they are able to receive a telepathic message on that frequency. For the most part, unless a medium is very, very experienced indeed, he or she can be led astray by nuisance-entities who are playing at being humans and who can pick up the thoughts of what the 'caller' wants...