How Should Catholics Understand the Rogue Exorcist in Mark 9?

In Mark 9, we hear about a man unaffiliated with the disciples who casts out demons in Jesus’s name. This same episode is also recorded in Luke 9:49-50, while St. Matthew’s Gospel includes a variation on the warning Jesus delivers to His disciples: “He who is not with me is against me, and he who does not gather with me scatters.” For Catholic readers of the Gospels, the exorcist passage raises some interesting questions…

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