Hans LaRondelle, The Israel of God in Prophecy - Principles of Prophetic Interpretation, Andrews University Press, 1983, p. 78.
Through the Spirit of Christ, the believer becomes excited in the joy of discovery to discern new veins of truth in Scripture which confirm the spiritual unity of the Old and New Testaments. The Old Testament becomes to him a Christian book just as much as the New Testament; because “the entirety of the Old Testament points as one great arrow to the fulfillment which the New Testament records.”
Hans LaRondelle, The Israel of God in Prophecy – Principles of Prophetic Interpretation, Andrews University Press, 1983, p. 78.