God’s Unique Speaking in His Son

In Hebrews, we are confronted with a decisive shift in how God reveals Himself. God is not merely adding another prophet or extending the old system; He is speaking in a way that is utterly unique—through His Son. This is not a matter of new information layered on top of the old, but the final and authoritative unveiling of God’s heart, purpose, and provision. To ignore or diminish this speaking is to forfeit the very ground of our righteousness, our inheritance, and our rest.

The Law: A Tool of Disqualification, Not Life

The Mosaic Law was never the means by which humanity could secure righteousness or inheritance. It was a preparatory tool—a progressive revelation designed to expose human inability and point forward to the Gospel. The Law served as a schoolmaster, not to empower us, but to disqualify us. It proved, beyond all argument, that no flesh could be justified before God by works. Every attempt to attain righteousness through the Law ends in failure and condemnation. This was by design: the Law’s purpose was to drive us to the end of ourselves and prepare us for the only true solution—God’s promise in Christ.

The Everlasting Covenant: God’s Unilateral Promise

Long before Sinai, God established the Everlasting Covenant with Abraham—a covenant not based on mutual performance, but on God’s own faithfulness. Abraham was asleep when God cut this covenant, underscoring that it was not Abraham’s effort but God’s promise that mattered. This covenant was made with Abraham and his Seed—who is Christ. Abraham’s faith was counted as righteousness because it connected him to Christ, the true Heir. The promises—righteousness, inheritance, and eternal rest—are secured not by human striving but by Christ’s finished work as the Mediator.

To accept any system that mingles Law with promise is to undermine the very foundation of justification by faith. If the inheritance comes by Law, it is no longer by promise, and Christ’s work is rendered void. This is not a secondary issue; it is the difference between life and death, between sonship and slavery.

Christ: The Fulfillment and the Speaking

Christ, as the Seed, confirms and fulfills the Everlasting Covenant. In Him, all the promises to Abraham are realized. He is both the Mediator and the content of the covenant. God’s speaking in His Son is not a mere echo of past revelations; it is the radiance of God’s glory and the exact impress of His substance. When God speaks in the Son, He is not giving us more rules—He is imparting Christ Himself into us, transforming us from within and bringing us into rest.

This speaking is weighty, glorious, and authoritative. It is not an invitation to try harder, but a summons to believe and rest. By heeding this voice, we are brought out of the shadows of the Law and into the reality of sonship and inheritance.

The Church: Participation in the Inheritance

The Church is not an afterthought or a parenthesis in God’s plan. She is the fulfillment of the promises made in the Everlasting Covenant. In Christ, believers are seated with Him in the heavenlies, sharing in His reign and inheritance. The “Good Land” and eternal rest are not distant hopes but present realities for those who are in Christ. This is the substance; everything else is shadow.

What Is Lost If We Miss This

To reject or blur the unique speaking of God in His Son is to return to the Law, to forfeit rest, and to abandon the ground of our inheritance. If we make the Law our standard or our hope, we are left with disqualification and death. We lose the assurance of righteousness by faith, the guarantee of eternal inheritance, and the very experience of sonship. The Gospel is not “Christ plus Law.” It is Christ alone, the Mediator of the Everlasting Covenant, who guarantees everything by His finished work.

The Only Way Forward

God’s ultimate and unique revelation is in His Son. Every attempt to supplement or replace this speaking is a denial of the Gospel itself. The Law has done its work: it has shown us our need and pointed us to Christ. Now, God speaks in the Son—authoritatively, finally, and transformatively. To heed this voice is to enter rest, to receive righteousness by faith, and to participate in the eternal inheritance secured by Christ alone.

Let no one deceive you: to compromise here is to lose everything. Stand in the finished work, heed the voice of the Son, and refuse every system that would bring you back under the yoke of Law. The Everlasting Covenant stands, and Christ is its Mediator. In Him, you have everything.