"The question is: Why would [ETs] need technology and ships at all.
"They don't need them any more than we do. Astrally, we can go anywhere we want to!... But technological means and spacecraft are necessary if you are going to exist materially in difficult environments --say underwater, in deep space, etc. So even very advanced ET peoples do have craft....
"These ETs are from material worlds like earth and they have biological people on them, who are evolved enough in consciousness to develop their material sciences so that they involve these other finer levels of the cosmology, including consciousness, the astral realm and the causal/thought vibration realm."
Source: Hidden Truth - Forbidden Knowledge by Steven M. Greer M.D., pages 285-286.