Is Scripture ‘finished’ being written?
Christians believe it is. How so? Catholics and Protestants don’t agree on which books are to be included, and various leaders in church history have thought it best to leave certain books out, such as Revelation or James.
One way to begin discussing the question is to think about the Jewish Scriptures, the Old Testament or the Tanakh. Broadly speaking, this grouping of Scriptures are records of, and reflections on, at least four key, formative, identity-establishing events: a) Creation, b) Election, c) Exodus and d) Exile. You cannot be Jewish and not identify with those events, and thus the Jewish Scriptures would not be complete without records and reflection on all of them.
In the same way, the Christian Scriptures incorporate all of these events into a further climactic Christ Event (which is shorthand for a series of events: Birth, Life, Death, Resurrection, Ascension). In addition, you have the launch of the Church, partnering with God’s redemptive mission in anticipation of the fulfillment or ‘consummation’ of the coming of God’s Kingdom “on earth as it is in heaven.” Thus the Christian Scriptures, like Christian identity, are not complete without addressing Creation, Election, Exodus, Exile, Christ, Church and Consummation. Whereas hope of a coming Messiah is implicit in the Jewish Scriptures, the hope of a consummated Kingdom is explicit in the Christian Scriptures.
So then, just as the Jewish Scriptures are a complete and coherent witness to the identify forming events of Judaism, so also the Christian Scriptures (with or without the Apocryphal books that divide Catholics and Protestants) are a complete and coherent witness to the identity forming events of Christian faith and hope.