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5. For Moses, etc. To render it evident how much at variance is the righteousness of faith and that of works, he now compares them; for by comparison the opposition between contrary things appears more clear. But he refers not now to the oracles of the Prophets, but to the testimony of Moses, and for this reason, — that the Jews might understand that the law was not given by Moses in order to detain them in a dependence on works, but, on the contrary, to lead them to Christ. He might have indeed referred to the Prophets as witnesses; but still this doubt must have remained, “How was it that the law prescribed another rule of righteousness?” He then removes this, and in the best manner, when by the teaching of the law itself he confirms the righteousness of faith.

But we ought to understand the reason why Paul harmonizes the law with faith, and yet sets the righteousness of one in opposition to that of the other: — The law has a twofold meaning; it sometimes includes the whole of what has been taught by Moses, and sometimes that part only which was peculiar to his ministration, which consisted of precepts, rewards, and punishments. But Moses had this common office — to teach the people the true rule of religion. Since it was so, it behooved him to preach repentance and faith; but faith is not taught, except by propounding promises of divine mercy, and those gratuitous: and thus it behooved him to be a preacher of the gospel; which office he faithfully performed, as it appears from many passages. In order to instruct the people in the doctrine of repentance, it was necessary for him to teach what manner of life was acceptable to God; and this he included in the precepts of the law. That he might also instill into the minds of the people the love of righteousness, and implant in them the hatred of iniquity, promises and threatening were added; which proposed rewards to the just, and denounced dreadful punishments on sinners. It was now the duty of the people to consider in how many ways they drew curses on themselves, and how far they were from deserving anything at God’s hands by their works, that being thus led to despair as to their own righteousness, they might flee to the haven of divine goodness, and so to Christ himself. This was the end or design of the Mosaic dispensation.

But as evangelic promises are only found scattered in the writings of Moses, and these also somewhat obscure, and as the precepts and rewards, allotted to the observers of the law, frequently occur, it rightly appertained to Moses as his own and peculiar office, to teach what is the real righteousness of works, and then to show what remuneration awaits the observance of it, and what punishment awaits those who come short of it. For this reason Moses is by John compared with Christ, when it is said,

“That the law was given by Moses, but that grace
and truth came by Christ.” (John 1:17.)

And whenever the word law is thus strictly taken, Moses is by implication opposed to Christ: and then we must consider what the law contains, as separate from the gospel. Hence what is said here of the righteousness of the law, must be applied, not to the whole office of Moses, but to that part which was in a manner peculiarly committed to him. I come now to the words.

For Moses describes, etc. Paul has γράφει writes; which is used for a verb which means to describe, by taking away a part of it [ἐπιγράφει.] The passage is taken from Leviticus 18:5, where the Lord promises eternal life to those who would keep his law; for in this sense, as you see, Paul has taken the passage, and not only of temporal life, as some think. Paul indeed thus reasons, — “Since no man can attain the righteousness prescribed in the law, except he fulfills strictly every part of it, and since of this perfection all men have always come far short, it is in vain for any one to strive in this way for salvation: Israel then were very foolish, who expected to attain the righteousness of the law, from which we are all excluded.” See how from the promise itself he proves, that it can avail us nothing, and for this reason, because the condition is impossible. What a futile device it is then to allege legal promises, in order to establish the righteousness of the law! For with these an unavoidable curse comes to us; so far is it, that salvation should thence proceed. The more detestable on this account is the stupidity of the Papists, who think it enough to prove merits by adducing bare promises. “It is not in vain,” they say, “that God has promised life to his servants.” But at the same time they see not that it has been promised, in order that a consciousness of their own transgressions may strike all with the fear of death, and that being thus constrained by their own deficiency, they may learn to flee to Christ.