“Seth material” search engine (Jane Roberts)

These people, as remnants, really, of the first great civilization, always carried within themselves strong subconscious memories of their origin. I am speaking of the Lumanians now. This accounted for their quick rise, technologically speaking. But because their purpose was so single-minded — the avoidance of violence — rather, say, than the constructive peaceful development of creative potential, their experience was highly one-sided. They were driven by such a fear of violence that they dared not allow the physical system freedom even to express it.

Their vast technology and their great civilization was largely underground. They were, in those terms, the original cavemen, and they came out from their cities through caves also. Caves were not just places of protection in which unskilled natives squatted. They were often doorways to and from the cities of the Lumanians. Long after the cities were deserted, the following natives, uncivilized, found these caves and the openings.