Yes, we fail, we sin, and we are not yet finally delivered from the indwelling corruption that always sees and feels the Law as enemy and condemner. But a radical change has taken place. The law of God is once again the delight of God’s sons, bringing liberty to us. So what is the place of the Law in the life of the Christian? Simply this: We are no longer under the Law to be condemned by it, we are now “in-lawed” to it because of our betrothal to Christ! He has written the Law, and love for it, into our hearts!
Since the time of the Reformation in the sixteenth century, the question has been asked endlessly: “What is the role of the law of God in light of the gospel?” The Apostle Paul found himself asking it (for example, Gal. 3:19: “What purpose then does the law serve?” NKJV). He had a profound sense of the place of the Law in the history of redemption and in the covenant purposes of God. But he also answered the question in terms of the life of the believer (for example, in Romans 8:3–4). Ever since, Christians have faced the challenge of walking the thin red biblical line that avoids the dangers of legalism on the one hand and antinomianism on the other.
The anonymous author of Hebrews was fascinated by the relationship between the Law and the gospel. He explained how the Mosaic administration was like a shadow cast backwards into the old covenant period by the work of Christ in the new covenant (Heb. 8:5). Now that the new covenant has been forged in the blood of Christ, the old is revealed for what it always was, shadow rather than reality. Now it is “obsolete” (8:13).
Using the word “obsolete” about the Law makes some Christians nervous! So here, first of all, is something to think about: Unless I can say loudly enough for others to hear: “In Christ, God has made the Mosaic covenant obsolete” I must cease reading Hebrews, or at least stop reading it before I get to chapter 8, verse 13! The ability to absorb into one’s mental and spiritual constitution the full force of what is being said here is surely a hallmark of true New Testament liberty.
The author of Hebrews (a pastoral theology genius if ever there was one) resolves our problem in a remarkable way. The new covenant renders the old obsolete. And one of the ways God renders it so is this: “I will put My laws in their mind and write them on their hearts” (Jer. 31:33, cited in Heb. 8:10; 10:16).