The problem with the notion of separation is its expressive, self-purifying character. It will not wait for God to purify his own church in his own time. Schisms may come, but woe to that church through whom they come! There is no right, or duty, of schism. As unity is given to the church as a gift, so it is taken away as a judgment. But on no account can disunity be a course of action that the church may embrace in pursuit of its mission or identity. 

Oliver O’Donovan, Church in Crisis, 33-34.

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