Pastoral Epistles 04 - Excommunication

Even though Paul was familiar with the beliefs of Christians, he says that he had an ignorance of Christianity. The people that are causing trouble in Ephesus are not in a similar situation. They are or were in some sense believers, but have gone astray, and Paul says that they must be separated from the Church by excommunication, hopefully to see the error of their ways and rejoin the Church.