The boy with the unclean spirit gave Jesus an occasion to explain what he expects from his followers. He told his disciples they were an unbelieving and perverted generation because they cast out this demon. Jesus considered spiritual impotence to be unbelieving and perverted. Wow!
Jesus gets serious about getting to Jerusalem. The disciples didn't understand. When the Samaritans didn't either, John and James were ready to call down fire from heaven. It is interesting how quickly people who don't understand are quick to invite God's condemnation on others!
Great principle: Whoever is not against us is for us. Usually we operate with the opposite principle. This is much more inclusive and inviting.