“Seth material” search engine (Jane Roberts)

He learns from failure as well as success. You think of physical history as beginning with the caveman and continuing up to the present, but there have been other great scientific civilizations; some spoken of in legend, some completely unknown — all in your terms now vanished.

The members of this civilization were largely a fringe group from the earlier successful civilization, most of whom had decided to continue existence in other areas of your physical universe. These, however, were particularly enamored of earthly life, and also thought that they could improve upon the last experiment in which they had been involved, though they were free to move on to other layers of existence.

They formed energy fields around their own civilization. They were, therefore, isolated from contact with other groups. They did not allow technology to destroy them, however. More and more of them realized that the experiment was not a success. Some, after physical death, left to join those from the previous successful civilization, who had migrated to other planetary systems within the physical structure.