The following passage is from a book called The Centrality and Supremacy of the Lord Jesus Christ by T. Austin Sparks. This little passage, which you could say is only even in the introduction to this incredible work, contains the key to how we are to truly understand all scripture in both the Old and New Testaments. Enjoy!
THE CENTRALITY AND SUPREMACY OF THE LORD JESUS IS THE PIVOT AND THE KEY TO ALL THE SCRIPTURES
Of course the Lord Jesus Himself has told us as much. We know from Luke 24 that that is so. There we find Him taking Moses, the Psalms, and all the Prophets, and in them all speaking of the things concerning Himself. So that in our reading of the Word of God, WHEREVER we happen to be reading, the question that should always be in our minds is “What has this to do with Christ?”; and if you bring that question to your reading of the Word of God, wherever you may read (and that is not said without thought) you will at once get a new understanding of the Word, you will have a new value in your reading; for the Scriptures, and ALL the Scriptures, are they which speak of Him; although you may have difficulty sometimes in tracing Him, yet He is there. The cumulative effect of all parts of the Word of God is to bring you to Christ. You must not read the Word of God as history, narrative, prophecy, or as anything else as a theme in itself, but always ask the question: “What has this to do with Christ?” and until you can find what it has to do with Christ you have not found the key.