In an early journal article Jurgen Moltmann suggests a helpful continuum to understand the history of the church. He suggests that the church moves between the two poles of relevance and identity; in the world but not of the world, incarnated in the world with a citizenship in heaven. If it moves too far to one side there is a reaction the other way.
In the current turmoil in the Anglican Communion we can see this continuum and the conflict arising within it at work. Today we might use the term intelligibility rather than relevance. (I'm being kind here because deep down I think the temptation is to be relevant, which implies that irrelevance is just around the corner.) Of course, both poles in the current debate would claim that they are being both faithful to their Christian identity and intelligible, although in a candid moment the right would admit identity is more important to them and the left would admit that intelligibility is key for them. When a parish, diocese, Province or Communion holds together those from opposing poles then we have integrated the continuum. That is, communion prevents the narrowness that an emphasis on one pole or the other necessarily brings.