“When it comes to the ‘ecumenical question,’ we appear to have divided between two positions. The first says we should accept all kinds of heretical ‘Christians’ with all friendliness. The other says we should reject their heresies, along with their title to the name Christian. We have two positions. The first is that husbands cannot commit adultery, and the second is that adulterers are not husbands, and hence not adulterers. What never occurs to anyone is the duty of fighting our fellow Christians to the last ditch, as Athanasius did with Arius.”
The Cultural Mind, p. 247