The quote is from the book Demonology Past and Present.

….case involves a person suffering from a pronounced compulsion neurosis. A young woman, 28 years old, came to me to be counseled. She had been undergoing psychiatric and psychotherapeutic treatment for a number of years but without avail. Her compulsion to wash herself, to count things, and to eat, still remained. She was in a terrible state. Her compulsion to eat was so strong that she would continue stuffing food into her mouth until she was sick, only to start all over again. When she finished her story I asked her if she had had any contact with spiritism. “Yes,” she replied, “both my mother and my grandmother are very active spiritists. They often took me along to spiritistic meetings when I was a child.”

Many people, on hearing a case like this for the first time, find it difficult to believe that there is any relationship between occult practices and the development of a neurosis. Suffice it to say, however, that in more than 50% of the neurotic people I have dealt with, this relationship was present. Every psychiatrist knows how long and often futile the treatment of a neurosis can be. But why this? Because one of the most frequent causes of the complaint is not recognized by the medical profession. An incorrect diagnosis leads to the wrong treatment. A large proportion of neurotic people instead of consulting a psychiatrist should go to a Christian counsellor…..However, among the millions of people suffering from neurotic illness in the world today, there must be hundreds of thousands who are suffering as  a result of some occult subjection. Because our psychiatrists and psychologists continue to maintain that metaphysical influences simply do not exist, every one these people receives the wrong therapy for his particular complaint. Every form of disease can be explained on a purely imminent basis, so the rationalist maintains, but in voicing this inhibition of his – philosophically it would be called an ‘a priori’ definition – he reveals that he is in the position neither to recognize nor to treat those depressions and neuroses which are caused by occultism. Many specialists are therefore simply of no use in this field, their university education having closed their eyes to one of the factors involved.

…The mind and soul of man is the most precious part of God’s creation. Why then do we so often ignore our Creator when it comes to the treatment of this most hallowed part of man?