Max Heindel 
Etheric Vision And What It Reveals [EPUB ebook] 

In 1918 Max Heindel wrote: “The process of
preparation for the Aquarian Age has already commenced;
and as Aquarius is an airy, scientific, intellectual sign, it is
a foregone conclusion that the new faith must be rooted in
reason and able to solve the riddle of life and death in a
manner that will satisfy both the mind and the religious
instinct.” As we have in the past evolved five senses by
means of which we contact the present visible world, so
shall we in the far distant future evolve another sense
which will enable us to see the denizens of the Etheric
Region, including those of our dear ones who have left the
physical body and inhabit the ether and lower Desire
World during the first stage of their career in the spiritual
realms.