Luther on Romans 10:6, where the apostle Paul quotes Deuteronomy 30:12 (“But the righteousness based on faith says, ‘Do not say in your heart, “Who will ascend into heaven?” ’—that is, to bring Christ down...”):
Moses in Deut. 30:12 does not use these words in this sense, but the apostle out of the abundance of his own feeling and spirit brings out the real kernel, teaching us with a strong argument that the entire Scripture deals only with Christ everywhere, if it is looked at inwardly, even though on the face of it it may sound differently by the use of shadows and figures. Hence he also says that Christ is the end of the Law (v. 4), as if to say that all Scripture finds its meaning in Christ.
From “Lectures on Romans” by Martin Luther (Vol. 25, p. 405, Luther's Works, Concordia Publishing House, St. Louis, 1972).