Much of Jesus’ work was healing, with many of his teachings illustrating the healings. Nine of Jesus’ healing stories are actually exorcisms. While the term may be off-putting, the fact that there are so many exorcisms in the Gospels speaks to their importance. I believe “possession by devils” refers to what we now call addiction. The “possessed” person is in some sense trapped by a larger force and is powerless to do anything about it. The only cure for possession is “repossession” by Something Greater than the disease. This is why Bill Wilson said that a “vital spiritual experience” is necessary for full recovery.
I’m convinced that when the great medieval spiritual teachers talked so much about attachment, they were really talking about addiction. We are all attached and addicted in some way. At the very least, we are addicted to our compulsive dualistic patterns of thinking, to our preferred self-image, and to the usually unworkable programs for happiness we developed in childhood—which then showed themselves to be inadequate or even wrong.