There exist a plethora of definitions to the concept of delusion. Some are quite general, some more specific, and some more in-depth. Yet, it is accepted that preventing or curing delusional thinking has not yet acquired a tactical procedure or approach.
Ostensibly, this means that the essence of any bona fide delusion is simply not understood by the vast majority of theoretical and/or practicing clinicians. Historically, it means that the trigger, the motive, and the psychic arrangement of forces of the phenomenon defined as delusion have been elusive. Dr. Kellerman, the author of Personality: How it Forms, brings the problem of delusion into sharper focus for a better understanding.