45. Bad spirits increase most abundantly around the Earth on account of the moral inferiority of its inhabitants. Their wrongdoing in a measure is the cause of the plagues to which humanity is exposed here below. Obsession, which is one of the effects of this action, like maladies and all tribulations of life, must then be considered as a trial or expiation, and accepted as such.
Obsession is the persistent action which a bad spirit exercises over an individual. It presents many different characters, from the moral influence without any distinct exterior signs, to complete disturbance of the organism and of the mental faculties. It destroys all mediumistic faculties. In hearing and psychographic mediumship an obstinate spirit manifests to the exclusion of all others.