Mark 9:38-40: A man casting out demons in Jesus's name but not part of the Twelve. The disciples tried to stop him. Jesus: "Do not hinder him — whoever is not against us is for us." The organic growth of Christianity always outpaces organizational growth. We must resist suspicion toward genuine believers outside our circle/denomination.

The disciples assumed only their approved group could minister in Jesus's name. But Christianity grows beyond organizational boundaries — Apollo's wasn't in Paul's group, random Gentile believers appeared in cities. Calvary Chapel anecdote: a worship leader left for a non-Calvary church and was criticized. As groups age, they become more isolated and gated — this is unhealthy. Proper ecumenism: embrace genuine believers outside your circle without embracing false teaching.