What book are you referencing. Sounds interesting.
Scott Peck, a psychiatrist, minister and successful author wrote many excellent books. His first and most popular was “The Road Less Traveled.”
Later he wrote “People of the Lie: The Hope for Healing Human Evil” in 1983. His last book, “Glimpses of the Devil: A Psychiatrist’s Personal Accounts of Possession, Exorcism, and Redemption” was published in 2005, the year he died.