From the ascended masters’ perspective, automatic writing is one of the most dangerous types of mediumistic activity. In this process, an individual allows the physical body to be controlled by a spirit that writes or types messages. Most people who engage in this are very much caught up in their ego; the spirits engage them with personal messages and flattery. (In fact, this is the point of vulnerability of many people who engage in psychic activities.) An individual, by repeatedly ceding control of the mind and body to astral entities in this way, may eventually lose the ability to control their own consciousness, and thus become subject to all manner of “voices” and projections from the astral plane that they can no longer control or distinguish from the real world.
For more information
Mark L. Prophet and Elizabeth Clare Prophet, Paths of Light and Darkness, chapter 2, “Psychic Thralldom”
Mark L. Prophet and Elizabeth Clare Prophet, Paths of Light and Darkness, p. 132.