Exorcising a boy possessed by a demon from Très Riches Heures du Duc de Berry, 15th century.
"Barbara" had been involved for many years in pagan practices. She was deeply involved in worshipping non-christian "deities". She also spiritually bonded and subjugated herself to a guru who claimed to be enlightened. She said he was a "sort of magician" and practiced sorcery. However, she eventually turned away from these pagan practices and return to her Catholic roots.
But the guru and his associates would have none of it. During the nighttime, she was the target of their demonically-empowered obsessions. Invoking their sorcery, (which was really working through demons), they tormented and threatened her. They claimed they would give her cancer. They said she would have a heart attack. They threatened to drag her to hell. She said these gurus were "very powerful" and she was terrified.
Barbara not only needed liberation from these gurus and their demons, she needed catechesis on the Truth. The priest working with her, again and again, spoke to her of surpassing power of Jesus Christ. He urged her not to be afraid of the gurus but to trust in Jesus. After many years of being away from the faith and immersed in paganism, this was not easy for her.
The priest realized that, in order to be convinced, she had to have a personal experience of the power of Christ. So he said to her, "They are just trying to scare you. They have no such power over you to give you cancer or drag you to hell. The next time they attack you, remind yourself that you are a daughter of God, Creator of Heaven and Earth. Then, with full trust, say out loud three times: 'In the name of Jesus, I declare that you have no power over me! I am a daughter of God. In the Name of Jesus I command you to be gone-- now!' He promised, 'The guru will run away scared."
Barbara responded, "That's good advice. I'll do it." The next day she texted back: "When they started to harass me during the night, I did what you advised and they backed off. Wow!"
So many people are afraid of Satan and his minions, including some priests. A critical part of the process of liberation, and the journey of salvation for us all, is coming "to know Christ and the power of his resurrection" (Phil 3:10).