There is a phenomenon in nature unknown, and therefore rejected by physiology and psychology in our age of unbelief. This phenomenon is a state of half-death. Virtually, the body is dead; and, in cases of persons in whom matter does not predominate over spirit and wickedness not so great as to destroy spirituality, if left alone, their astral soul will disengage itself by gradual efforts, and, when the last link is broken, it finds itself separated forever from its earthly body. Equal magnetic polarity will violently repulse the ethereal man from the decaying organic mass. The whole difficulty lies in that 1, the ultimate moment of separation between the two is believed to be that when the body is declared dead by science; and 2, a prevailing unbelief in the existence of either soul or spirit in man, by the same science.
Helena Petrovna Blavatsky