A Christian dogmatics of holiness is not metaphysics, because the holy God, reaching out in the world in Son and Spirit, is the sanctifier; not is it mysticism (or moralism), because human reality is holy only in dependence upon the Spirit of the Son who makes holy. Thus, as Barth puts it, a trinitarian dogmatics of holiness ‘cannot seek to have merely one centre, one subject’ precisely because ‘its subject is God’–God known as holy in the incarnate Word and life-giving Spirit.

John Webster, Holiness, 7