Galatians 3:16-17

Galatians 3:16-17. Now to Abraham and his seed were the promises made. He saith not, And to seeds, as of many; but as of one, And to thy seed, which is Christ. And this I say, that the covenant, that was confirmed before of God in Christ, the law, which was four hundred and thirty years after, cannot disannul, that it should make the promise of none effect.

That is clear enough. The covenant made with Abraham and his seed cannot be affected by anything that was said or done on Sinai. Whatever the covenant of works may be, or say, or do, it comes in more than four centuries after this glorious covenant of grace had been signed, and sealed, and ratified; and therefore it cannot be affected, it must stand fast for ever.