How do demons get into a person's life?

I.

Direct involvement with the occult.

This is the most consistent entry point, and the one almost every exorcist names first. The category is broad and includes practices people often consider harmless:

Ouija boards, tarot cards, séances, Wicca and witchcraft, fortune-telling, palm reading, mediums and psychics, automatic writing, astral projection, contacting "spirit guides," New Age channeling, certain forms of yoga or meditation that explicitly invoke spirits, occult video games, occult role-playing games, books and movies that go beyond fiction into ritual.

The principle the Church teaches: any deliberate attempt to communicate with, invoke, or draw on spiritual power outside of God opens the soul to whatever responds. And what responds is rarely what the person hoped. Exorcists report that "Uncle Joe" almost never appears on the other side of a Ouija board. Something pretending to be Uncle Joe does.

Even casual involvement — "just for fun at a sleepover" — can establish a foothold. Children are especially vulnerable because they don't know they're doing anything serious. They are.

II.

Serious habitual sin.

The second consistent pattern: persistent, deliberate, unrepented serious sin gradually opens a person's interior life to demonic influence. The mechanism is straightforward in Catholic teaching. Sin is a turning away from God; habitual serious sin is a sustained turning away. The further a soul turns from grace, the less protection it carries.

The specific sins exorcists most commonly cite: long-term involvement in pornography (which often touches the occult more directly than people realize), unrepented sexual sin involving manipulation or violence, drug use (especially psychedelics and substances historically associated with shamanic practice), serious unforgiveness and held-onto hatred, and the cultivation of pride and contempt over time.

The Church teaches that ordinary temptation works on everyone all the time. That's not what this is. This is the cumulative effect of doors deliberately left open year after year, eventually becoming wide enough for something to walk through.

III.

Curses, hexes, and spoken accusations.

This sounds medieval and a lot of modern Catholics dismiss it. Working exorcists do not. They report regularly seeing people afflicted because of curses spoken over them — sometimes by practitioners of dark arts in the family or community, sometimes by people who don't realize what they were doing.

The Catholic Church does not teach that words have magical power on their own. But it does teach that demons can attach themselves to ritual acts and to spoken intentions, especially when the speaker has invited demonic cooperation. A curse spoken by a witch in a deliberate ritual is not the same as someone yelling in anger. The former is an opening offered to demonic powers; the latter is not.

This is part of why the prayers of the Catholic rite of exorcism specifically renounce and break curses, hexes, spells, vows, and demonic bondages by name.

IV.

Sin committed against the person.

Fr. Ripperger's observation that roughly half of cases involve sin done to the person is pastorally important. The most common patterns: severe trauma in childhood, sexual abuse, occult activity by family members (especially parents), generational involvement in serious anti-Christian practices (Freemasonry is the example exorcists cite most often), and ritual abuse.

These are doors the person never chose to open. The Church teaches that this isn't moral guilt on the part of the victim — they did nothing wrong. But the spiritual reality is that wounds inflicted on a soul can still create vulnerability, especially when those wounds are inflicted by people who themselves had ties to the demonic.

This is one of the reasons the Catholic Church takes the spiritual life of families so seriously. What parents do affects children spiritually, not just emotionally. That's a hard truth — but it's also the basis for one of the Church's most consoling teachings: those same spiritual ties can be cleansed and healed, even decades later, through the sacraments and through prayer.

This is also why generational sin is a real category in Catholic theology, despite occasional modern attempts to dismiss it. Fr. Carlos Martins points to a clear scriptural example: when David sinned by ordering a census against God's law, God did not punish David alone. The consequences fell on his people. When David sinned with Bathsheba and arranged her husband's death, the consequences fell on the infant who was born. The pattern is uncomfortable but the Bible records it openly. Sin committed by a person in spiritual authority — a parent, a leader, a king — has real downstream effects on those under their care.

The encouraging part of this teaching is that the same God who allows the patterns also provides the means to break them. The Catholic Church has, from the apostolic age, baptized children precisely to address inherited spiritual condition. Confession, deliverance prayer, the sacraments — these reach backward through family lines as well as forward.

V.

Objects, places, and prolonged exposure.

The Catholic tradition has always taught that physical things can be vehicles of grace (relics, the Eucharist, holy water, blessed objects) — but also that physical things can carry the opposite. Items used in occult ritual, objects from cursed places, items deliberately dedicated to demonic powers, even certain artistic works produced with explicit invocation of dark spirits — these can sometimes function as channels for influence.

Exorcists report cases involving inherited objects (a grandmother's tarot deck stored in the attic, a piece of jewelry from a Masonic ancestor, art bought at an estate sale that turned out to come from a practitioner). The standard pastoral counsel is to burn or destroy such items and to have the home blessed by a priest.

Likewise, prolonged exposure to places associated with serious evil — sites of murder, occult ritual, or grave desecration — can leave spiritual residue that affects people who live or work there. This is part of why house blessings exist as a real, formal Catholic rite and not just a sentimental custom.