Fr. de Meo described the unsettling reaction that a possessed person usually has, detailing a common response to the exorcist's prayer.
“There's no lack of frightening facial expressions, threatening words or gestures and other things,” he said, “but especially blasphemies against God and Our Lady.”
The Catechism of the Catholic Church emphasizes the importance of distinguishing between demonic activity and mental illness. From paragraph 1673: “Exorcism is directed at the expulsion of demons or to the liberation from demonic possession through the spiritual authority which Jesus entrusted to his Church. Illness, especially psychological illness, is a very different matter; treating this is the concern of medical science. Therefore, before an exorcism is performed, it is important to ascertain that one is dealing with the presence of the Evil One, and not an illness.”
In April of 2015, the Vatican Congregation for the Clergy and the Sacerdos Institute hosted a seminar at Rome's Regina Apostolorum University, specifically aimed at training priests and lay people in spotting the differences between psychological problems and demonic possession.
The conference included interventions from a wide range of experts in the field of exorcism, including practicing exorcists, medical professionals, psychologists, lawyers, and theologians.
Fr. de Meo also emphasized that not all cases of possession are going to look the same, which is why it is so important for exorcists to go through rigorous training.
“It's up to the priest serving in this ministry to know how to deal with the case, by the will of God, with love and humility,” he said.
“For this reason, with my bishop's authorization, for 13 years, I've led a school for exorcists. I've tried to especially prepare those who are beginning this ministry,” he said.
However, even though cases of demonic possession are not as common as cases of psychological illness, most people are too unaware and unfamiliar with spiritual realities, he said.
In 2014, the International Association of Exorcists (AIE) called the rise of occult activity a “pastoral emergency.”
“It usually starts out of ignorance, superficiality, stupidity or proselytizing, actively participating or just watching,” AIE spokesperson Dr. Valter Cascioli told CNA at the time.
“The consequences are always disastrous.”
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Father de Meo said that people often turn to “the chatter of magicians and Illusionists” for answers, rather than “the weapons the Lord has put at our disposal.”
While people often seek radical answers or signs, the best defense against demonic possession is a simple and sacramental life of prayer, the priest said.
“It's absolutely fundamental to get rid of sin and live in the grace of God,” he said.
“The Church in fact, wants a life of prayer, Not just on the part of the priest but also the (member of) the faithful asking for the intervention of the exorcist, who benefits from the help of family members as well,” the exorcist explained.
The Catechism offers further guidance on how to avoid demonic activity: anything that involves recourse to Satan or demons, or that attempts to conjure the dead or reveal future events, is to be rejected.
From CCC paragraph 2116: “Consulting horoscopes, astrology, palm reading, interpretation of omens and lots, the phenomena of clairvoyance, and recourse to mediums all conceal a desire for power over time, history, and, in the last analysis, other human beings, as well as a wish to conciliate hidden powers. They contradict the honor, respect, and loving fear that we owe to God alone.”