“Among the essentials the Eastern churches include also their polity, and so do the Roman, the Anglican, and most of the Reformed churches. All of them, of course, regard as essential also the Church’s doctrine. Disunity in the proclamation is a sad sign. It cannot be remedied by viewing it as unimportant. To set up, in the face of this disunity, a merely external unity or union is not only to use a poor substitute but also to deny that which makes an assembly of people the Church in the first place.”