What Is the Difference between Demonic Possession and Obsession?

The difference lies in the degree and in the place of the demon’s action. In possession, he dominates the body and, during the crisis, blocks the higher faculties of the soul. In obsession, the harassment remains external – insistent thoughts, images, and disturbances – and the person’s freedom remains intact, with full moral responsibility for their acts.

The Roman Ritual itself preserves this distinction in its own language. In describing those for whom the helps of the Church are intended, the official text speaks of two different conditions: “Given these real circumstances, the Church implores Christ the Lord and Savior and, trusting in His power, provides the tormented or possessed faithful with various helps, so that they may be freed from diabolical oppression or possession.” [Rituale Romanum. De Exorcismis et Supplicationibus Quibusdam, Portuguese ed., n. 10]. Tormented and possessed are not synonyms – they are two states, and the same sentence then distinguishes “oppression” from “possession.”

The Four Degrees of Extraordinary Action

The practice of exorcists does not work with only two states, but with four. The psychiatrist Héctor de Ezcurra, who collaborates with exorcists and drew up a guide to discernment with comparative tables for twelve clinical situations, formulates in this way the question that governs each table: “How is this psychopathological condition to be distinguished from demonic possession, vexation, obsession, or infestation?” [H. de Ezcurra, O diagnóstico diferencial entre os distúrbios psicopatológicos e a ação extraordinária do demónio].

The scale is clear and worth fixing in mind, because almost all popular confusion is born of ignoring it:

• Infestation – the action falls upon places, houses, or objects, not upon the person.
• Vexation – external assaults on the body, without dominion over the faculties.
• Obsession – harassment of the imagination and of thought, insistent and oppressive, with the will remaining free.
• Possession – dominion over the body with the blocking of the higher faculties during the crisis.

The same order structures the classic treatise of Francesco Bamonte, an exorcist of the diocese of Rome, who treats separately the “examples of obsessions” and “demonic possession,” and devotes a chapter to their discernment [F. Bamonte, Possessões diabólicas e exorcismos].

The Signs the Church Examines

Bamonte lists, in the chapter on discernment, the indications examined in a supposed case of possession: speaking or understanding languages unknown to the person, knowledge of things or facts the person cannot know, abnormal physical strength or weight, and aversion to the sacred [Bamonte, op. cit.]. These are the signs the Roman Ritual consecrated and that tradition repeats – with one condition that is never dispensed with: first excluding the natural causes.

One further distinction should be noted, one that Bamonte treats expressly and that spares much suffering: the one between healing and deliverance, when the extraordinary action of the demon intersects with an illness [Bamonte, op. cit.]. Not every illness is the work of the evil one, and not everything that is the work of the evil one is cured with medicine.

The Boundary with Psychiatry

This is the point at which the Church most demands rigor. In 1963, João Carvalhal Ribas presented to the Escola Paulista de Medicina his professorial thesis As fronteiras da demonologia e da psiquiatria, whose structure already distinguished, among the clinical forms, diabolical temptation, diabolical obsession, and diabolical possession, examining for each one the supernatural, biological, and psychosocial causes [J. C. Ribas, As fronteiras da demonologia e da psiquiatria, São Paulo, 1963]. The collaboration between the exorcist and the physician is not a modern concession: it is an ancient requirement.

The Brazilian bishops situate the problem in its cultural context, pointing out the two symmetrical errors: on one side, the scientism that propagated the notion that only what is empirically verifiable is real, spreading the idea that the evil one does not exist and treating exorcism as superstition. On the other side, the despair that leads people of every class to seek out “therapies said to be miraculous” [CNBB, Exorcismos: reflexões teológicas e orientações pastorais].

A Serious Objection: Rahner and the Limit of the Distinction

It would be dishonest to present the distinction as undisputed throughout theology. Karl Rahner maintains a position that relativizes it, and the study by João Evangelista Martins Terra records it faithfully: for Rahner, from the religious point of view, “it is not possible, nor particularly important, to draw a precise boundary between diabolical possession and natural illness. All the more so because illness can be either a symptom of possession or a breach through which it may enter.” [J. E. M. Terra, A angelologia de Karl Rahner: à luz dos seus princípios hermenêuticos, 1996]. From this he concludes that there is no radical dilemma between resorting to exorcism or to medicine, “for even in the most natural illness the Christian must pray to obtain healing” [Terra, op. cit.].

The objection has pastoral force – it recalls that praying and treating are not opposed – but the practice of the Church does not follow it where the rite is concerned. The major exorcism is reserved for cases of moral certainty of possession, and the Ritual provides for it only after the natural cause has been excluded. Rahner dissolves the boundary on the religious plane – the Ritual maintains it on the canonical and sacramental plane, precisely in order to protect the sick person from a rite that does not cure him and the possessed person from a treatment that does not free him.

The Devil and the Demons: A Distinction That Helps

There is also a precision of vocabulary that the New Testament suggests and that the CNBB collection records: “In general, the devil is the tempter, the one who has the power to seduce and to tempt toward sin. The demons are limited to causing illnesses, whether of a physical or of a psychic order.” [CNBB, op. cit.]. Temptation – which reaches everyone – is the work of the tempting devil and leaves freedom intact. Possession, for its part, is attributed to the action of the demons upon the body. Whoever confuses the two planes ends up seeing possession where there is only temptation, or temptation where there is a rare and grave case.

What the Church Does in One Case and in the Other

Against diabolical oppression, the Ritual provides first for prayer, the sacraments, and the blessings. Only at a second stage, and for cases of possession, is the solemn rite resorted to: “Among these helps the solemn exorcism stands out, also called the great exorcism or major exorcism, which is a liturgical celebration.” [Rituale Romanum, n. 11]. And the Ritual itself explains this dominion of the devil: “This form of the devil’s dominion over man differs from that which affected man through original sin, which is really sin.” [Rituale Romanum, n. 10] – that is, possession is not a sin of the one who suffers it.

The deprecatory formula of the rite describes the condition of the tormented person with a moving sobriety: “the ancient adversary torments him fiercely, with mighty harshness oppresses him, with cruel terror afflicts him”, and it asks God to send His Holy Spirit “that He may strengthen him in the battle, teach him to pray in tribulation, and with His powerful protection defend him” [Rituale Romanum, n. 61].

The same prayer invokes “the prayers of the Blessed Virgin Mary, whose Son, dying on the cross, crushed the head of the ancient serpent” [Rituale Romanum, n. 61] – the liturgy of deliverance thus carries inscribed in its heart the enmity of Gen 3:15 and the figure of the New Eve, just as the defense of the faithful is entrusted to the archangel Michael, first adversary of the fallen angels.

Frequently Asked Questions

What are the degrees of the extraordinary action of the demon?

Four: infestation (places and objects), vexation (external assaults on the body), obsession (harassment of thought and imagination, with the will remaining free), and possession (dominion over the body with the blocking of the faculties during the crisis).

Does a possessed person sin while in crisis?

No. The Roman Ritual expressly distinguishes this dominion of the devil from the one that affected man through original sin, “which is really sin.” During the crisis, the higher faculties are blocked and there is no moral responsibility.

How is possession distinguished from psychiatric illness?

By the prior exclusion of the natural causes and by the examination of the signs that the Ritual and practice have consecrated – unknown languages, knowledge of hidden facts, abnormal strength, aversion to the sacred – always with medical collaboration. There are guides to discernment drawn up by psychiatrists precisely for this comparison.

Do all theologians accept this distinction?

Not without reservations. Karl Rahner maintains that, from the religious point of view, it is neither possible nor particularly important to draw a precise boundary between possession and natural illness, since illness may be a symptom or a point of entry. The canonical practice of the Church, however, maintains the distinction in order to reserve the major exorcism for cases of moral certainty.