"The astral body of a person either living or dead [usualy the latter state]. The vampire seeks to prolong existence upon the physical plane by robbing the living of their vital energies and misappropriating such energies to its own ends.

A healthy and pure person cannot become obsessed by them, because such Larvae can only act upon men if the latter make room for them in their minds. A healthy mind is a castle that cannot be invaded without the will of its master; but if they are allowed to enter, they excite the passions of men and women, they create cravings in them, they produce bad thoughts which act injuriously upon the brain; they sharpen the animal intellect and suffocate the moral sense. Evil spirits obsess only those human beings in whom the animal nature is predominating. Minds that are illuminated by the spirit of truth cannot br possed; only those who are habitually guided by their own lower impulses may become subjected to their influences."

Paracelsus_Franz Hartmann