If it is true that, as Tertullian said, ‘one Christian is no Christian’, then by the same token we should be able to say, ‘one bishop is no bishop’, and so ‘one local church alone is no church ‘. A bishop is not an individual who ‘represents’ the local church as if he is empowered to speak for its local identity like a politician for his constituency. The bishop is above all the person who sustains and nourishes within the local church an awareness of its dependency on the apostolic mission, on the gift from beyond its boundaries, of the Church established by the Risen Lord – and he does this, of course, primarily and irreducibly as the celebrant of the ‘Catholic oblation’. Hence, again from the earliest days, the clustering of local churches and their bishops around metropolitan sees which represented the channels through which the Gospel came to be shared; and hence the insistence (an insistence that might almost be called fierce in many instances) that bishops received ordination from their neighbours in the metropolia under the leadership of the local primate – and hence too the seriousness of communicating episcopal election by letter to the region and the severity of the sanction of removing a bishop’s name from the formal intercession list.
Primacy needs to be seen as a sign of the continuing reality of active tradition—that is, the sharing of the gift—as the foundation of each local church. So it should be exercised in the service of the further sharing of the gift; this is why it is problematic if a local church so interprets the gift it has received that it cannot fully share it beyond its own cultural home territory… reminding the local assembly and its chief pastor that it must not lose its recognisability or receivability to other communities – across the globe and throughout history.
Archbishop Rowan Williams Rome, Constantinople, and Canterbury: Mother Churches?