Part II · Sin, Law, and the Need for a Savior
νόμος
Nomos NO-mos
law
“Law, and What Law Cannot Do”
Confessional Lutherans treat the distinction between law and gospel as the most important hermeneutical key for reading the Bible. Get this distinction right and most of the New Testament opens up. Get it wrong and most of the New Testament gets misread.
The shortest version of the teaching is this: the law shows us what God demands. The gospel tells us what God has given. The law accuses. The gospel forgives. Both are God’s word. Neither is the other. And the most important skill a reader of the Bible can develop is the ability to tell, in any given passage, which one is being spoken.
The Greek word for the demand-side of this distinction is nomos. This chapter is about what nomos does, what nomos cannot do, and why the difference between those two questions matters more than any single chapter can fully explain.
The Word
νόμος (nomos), pronounced NO-mos. A masculine noun, second declension. The family is large: nomimos (lawful), nomikos (relating to law; as a noun, a lawyer or teacher of the law), nomothesia (the giving of law), nomotheteō (to enact law), paranomos (lawless, transgressor). Our English autonomy (self-rule) and Deuteronomy (the second law) descend from it.
The etymology is worth knowing. Nomos comes from the verb nemō (νέμω), “to allot, to distribute, to assign.” A nomos was originally what is assigned or allotted — including by custom. By extension, the word came to mean custom, established usage, the way things are normally done. From there it came to mean rule, ordinance, law in the binding sense — the rules a community has agreed to live by, the laws a city or nation has enacted, the requirements a god has imposed.
When the Septuagint translators reached for nomos to render the Hebrew torah (תּוֹרָה), they made a choice with long consequences. Torah is wider than “law.” It means “teaching, instruction” — and the Torah of Moses includes narrative, blessing, promise, and command together as one thing God taught His people. By rendering it as nomos, the LXX narrowed the field somewhat, in ways that affected later interpretation. The New Testament’s use of nomos inherits both the precision of the Greek legal sense and the broader Hebrew teaching sense, and a reader trying to make sense of a Pauline use of nomos sometimes has to ask which sense — or which combination of senses — is in play.
Range of Meaning
In its New Testament usage, nomos covers:
- Law in the general sense — established rule or custom, the regular ordering of things.
- Civil law — Roman law, for example, or the laws of a particular city.
- The Torah, the Mosaic Law specifically — the dominant New Testament sense, especially in Paul.
- The Old Testament Scriptures broadly — sometimes nomos means specifically the Pentateuch, sometimes more loosely the whole Old Testament or its commanding portions.
- A principle or pattern. Paul speaks of “the law of sin” (Rom 7:23, 25), “the law of the Spirit of life” (Rom 8:2), “the law of faith” (Rom 3:27) — uses where nomos is closer to “rule of operation” than to “commandment.”
- The standard of life for Christians. Paul uses “the law of Christ” (Gal 6:2) in this sense — though even here he is contrasting the new pattern with the old Mosaic pattern.
The dominant New Testament use is the Mosaic Torah. But Paul can shift between senses within a single argument, sometimes within a single verse. Romans 7–8 is the most demanding passage in the New Testament on this point, because nomos there does multiple kinds of work — Torah, principle of sin, principle of the Spirit — and only context shows which sense governs which occurrence. A reader who treats every “law” in Paul as if it meant the same thing will be confused by Romans 7 and 8 within a few verses.
Where You’ll Meet It
“For by works of the law no human being will be justified in his sight, since through the law comes knowledge of sin.” (Romans 3:20, ESV)
The keystone verse of the chapter. The law cannot justify. What the law can do — its actual function in God’s economy — is reveal sin. Paul says it not as a complaint about the law but as an account of what the law was always for. Through the law comes knowledge of sin. The law is the mirror that shows the sinner what he is.
“What then shall we say? That the law is sin? By no means! Yet if it had not been for the law, I would not have known sin. For I would not have known what it is to covet if the law had not said, ‘You shall not covet.’” (Romans 7:7, ESV)
Paul defending the law against the misreading that he has been attacking it. The law is not sin. The law is good. The law’s function is to reveal sin. Without the law, Paul would not have known coveting was sin. The diagnosis is what the law does well. The cure is something else.
“Now before faith came, we were held captive under the law, imprisoned until the coming faith would be revealed. So then, the law was our guardian until Christ came, in order that we might be justified by faith. But now that faith has come, we are no longer under a guardian.” (Galatians 3:23–25, ESV)
The Galatians 3 image: the law as paidagōgos, the household guardian who supervised children until they came of age. The law’s job in salvation history was to hold Israel in custody — restraining, instructing, revealing sin — until the One the law was always pointing toward arrived. That One has now come. The guardian’s specific function is finished.
“For Christ is the end of the law for righteousness to everyone who believes.” (Romans 10:4, ESV)
Telos — end. The word can mean “goal” or “termination” or both, and Paul is probably using both senses at once. Christ is the telos of the law for righteousness. The law was always heading toward Him. He is what the law was for. And in being what the law was for, He brings the law’s role in justification to its conclusion.
“Do not think that I have come to abolish the Law or the Prophets; I have not come to abolish them but to fulfill them.” (Matthew 5:17, ESV)
The other side of the balance. Jesus does not say the law is finished. He says He came to fulfill it. The law’s authority continues; what changes is the way it is fulfilled — first in Christ, who keeps it perfectly, and then in those who are in Christ, whose obedience is the fruit of faith rather than its precondition.
“For the law was given through Moses; grace and truth came through Jesus Christ.” (John 1:17, ESV)
John’s compressed statement of the law/gospel relationship. The contrast is sharp but not absolute — John does not say the law is bad and grace is good. He says the law was given through Moses (a real and good thing) and grace and truth came through Jesus Christ (a fuller thing). The two are related as expectation to fulfillment. The law was always anticipating what Christ delivered.
“Now we know that the law is good, if one uses it lawfully, understanding this, that the law is not laid down for the just but for the lawless and disobedient…” (1 Timothy 1:8–9, ESV)
Paul to Timothy. The law has a continuing function — restraining the lawless — but it is not laid down for the just. The justified are not under the law as its accusers. They have moved into a new relationship with what the law was always pointing toward.
What Confessional Lutherans Hear
Nomos — law
We hear nomos with two emphases the broader Christian conversation often softens.
First, the law’s defining spiritual function is to reveal sin and drive sinners to Christ. The classical Lutheran teaching identifies what theologians have called the three uses of the law. The first use is civil — the law restrains evil in society, keeping the worst impulses of fallen humans in check through fear of punishment. The second use is theological or spiritual — the law diagnoses sin, exposes the sinner to himself, and drives him to despair of his own righteousness and to faith in Christ. The third use is didactic — the law instructs the regenerate Christian as to what God’s will is for his life.
All three uses are real. Lutherans affirm all three (the Formula of Concord, Article VI, explicitly affirms the third use against the antinomian denial). But the second use — what the older Lutheran theologians called the usus theologicus or usus elenchticus, the convicting use — is the use that is decisive for justification. The law’s job is to make sinners know they are sinners. Romans 3:20 says it plainly: “through the law comes knowledge of sin.” A preacher who does not preach the law fails his hearers, because they need the diagnosis the law provides before they can rightly receive the gospel that addresses it.
C. F. W. Walther’s The Proper Distinction Between Law and Gospel[^1] is the indispensable Lutheran treatment of how this distinction operates in pastoral practice. Walther’s 25 propositions, delivered as evening lectures to seminarians in the 1880s, are the most thorough working out in print of what it means to apply law and gospel rightly in preaching, counseling, and Christian life. The Reformed tradition holds with Lutherans on the central insight that the law cannot justify, but tends to emphasize the third use of the law more positively as a continuing standard for Christian life. Lutherans hold the third use but typically place the spotlight on the second. The difference is one of emphasis, not absolute opposition.
Second, the law cannot justify — only Christ can. This is the central Reformation recovery, recovered in opposition to medieval Catholic teaching that had fused law and gospel and held that Christ’s grace enables Christians to fulfill the law and so be justified by their cooperation with grace. The Reformation said no. Justification is by faith alone, on the basis of Christ’s work, received as gift. Not by works of the law. Not by law-keeping of any kind. Not by faith-plus-something. By faith alone, in Christ alone, by grace alone.
This is why every move that smuggles law back into the gospel deserves the same Reformation response. When evangelical preaching turns the gospel into “make a decision and now do these things,” it has put law back into the gospel. When holiness teaching makes ongoing Christian victory a precondition of assurance, it has put law back into the gospel. When sacramental theology requires worthiness or sufficient repentance before the Supper, it has put law back into the gospel. The Reformation insistence — that the gospel is unconditional gift, received by faith — is not a once-for-all-recovered doctrine. It needs to be recovered weekly, in the preaching, in the pastoral care, in the catechesis, in the Christian’s own self-talk.
The pastoral payoff: when you are crushed by your own sin and despair of God’s favor, the answer is not “try harder to keep God’s law.” The answer is the gospel — Christ has fulfilled the law for you, has borne its curse, has given you His righteousness as gift. When you are complacent and proud and lukewarm and unbothered by your sin, the answer is not “more comforting gospel until you feel encouraged.” The answer is the law — to be confronted with God’s holy demand, to be shown your actual condition, to be brought to repentance and to fresh faith. Knowing which word you need at any given moment is what the Bible study leader and the Sunday school teacher and the lay preacher are constantly trying to discern, both for themselves and for those they serve.
The full entry in Just Enough Greek continues with “Where People Get It Wrong,” “So What,” and “If You Want to Go Deeper.”