When I weigh the kind of imperfection involved in tolerating an invalid baptism because some of our members are deeply persuaded that it is biblically valid, over against the kind of imperfection involved in saying to a son or daughter of the living God, “You are excluded from the local church,” my biblical sense is that the latter is more unthinkable than the former. The local church is a visible expression of the invisible, universal, body of Christ. To exclude from it is virtually the same as excommunication. And no serious church takes excommunication as an invitation to attend the church down the street.