If GHE can be shown to be an inadequate (though not entirely worthless) tool for interpreting the bible, what then is left? Are all interpretations equally valid? If the NT writers could take such extraordinary liberties with the OT text, are we free to do the same with their own books?
I think there are two answers to this question, two kinds of control.
First, there is the theological control. The NT writers interpreted the OT in particular ways to serve their hermeneutical goals. They interpreted it Christologically, ecclesiologically and eschatologically. Their understanding of the gospel determined their interpretation of the Scriptures which they believed preached the gospel. It's interesting that Christological interpretations are rare in the Pauline writings but common in Acts and the gospels. Since Paul was writing to believers, he had no need to prove that Jesus was the Christ - they knew that already. Rather, they needed to understand the nature of the church of which they were members. But Peter, for example, preaching at Pentecost, has quite a different aim. He does want his hearers to recognise their Messiah in the person of Jesus, and so he uses the OT for these ends.
Second, there is the community control. The bible is not an academic text intended for scrutiny by impartial observers. It is God's revelation for his people. So 'true' interpretation of the bible should be done by the people of God, for the edification of the people of God. I've touched on this before here. We shouldn't be surprised that interpretation of the bible done by unbelievers for their own self-promotion and career advancement, arrives at quite different conclusions.
Now, I'm not saying that Christians shouldn't think, or think hard, or take account of any academic research. Or that GHE has no value at all. But if we rely on method to get a reliable interpretation of scripture, we will immediately founder. And we will certainly never be able to show how 'all the Scriptures' speak of Christ.
McCartney again:
If our perception of larger divine intent in the OT is limited solely to those passages for which the apostles inspiredly spell it out for us, it seriously limits a Christian use of the OT.
and again:
We must... like Jesus and the apostles, go on to see and read the OT text in the context not just of the Bible as a whole, but in the context of redemptive history as a whole. In particular, we must read the OT with Christian eyes, with eyes that believe the OT as part of a gospel book, as a vital story that becomes our story because it is Christ's story. Should we employ the hermeneutic of the NT writers? Indeed we must.
