Justification by Faith Proved from Scripture
ROMANS 4:1–25Romans 3 ended with the thunderclap of the gospel: God is “just and the justifier of the one who has faith in Jesus” (3:26), and therefore “a person is justified by faith apart from works of the law” (3:28). That claim invites one enormous objection, and Paul knows it: this is new. If justification by faith alone is true, then Israel’s entire story has been misread, and Paul is preaching a novelty invented in the last twenty years. Chapter 4 is Paul’s answer, and it is not a fresh argument so much as a courtroom exhibit. He calls two witnesses whom no Jewish reader could dismiss—Abraham, the father of the nation, and David, the king after God’s own heart—and shows that both of them were justified precisely the way Paul says sinners are justified now. Far from being an innovation, faith-righteousness is the oldest thing in the Bible.
The chapter turns on a single word. Eleven times in twenty-five verses Paul uses the accounting term logizomai—“to count, reckon, credit, impute.” It is a bookkeeper’s word, the language of ledgers and accounts, and Paul builds his whole case on where God writes the entry. Righteousness is not earned in the left-hand column and paid out as wages; it is credited to an empty account as a gift. Luther and Calvin both saw that everything hangs here: if righteousness is credited to us on the basis of Christ’s work received by faith, then a sinner can have peace with God today (5:1) without waiting to become good enough—which he never would. Watch also for the chapter’s quiet climax: what looks like ancient history turns out to be about us. “The words ‘it was counted to him’ were not written for his sake alone, but for ours also” (vv. 23–24).
The question and the concession (vv. 1–2). Paul begins where his readers live: “our forefather according to the flesh.” What did Abraham gain—what did he find, discover, obtain—in this matter of being right with God? Then comes a devastating concession. If Abraham were justified by works, he would have grounds for boasting—“but not before God.” Paul does not deny that Abraham was, by any human measure, an extraordinary man. He denies that any such record can be produced in the one court that matters. Before God, the ledger of human achievement is not slightly short; it is worthless as a basis for acquittal. Calvin observed that boasting is the instinct Paul must kill first, because as long as a man has anything of his own to plead, he will never take righteousness as a gift.
The text that settles it (v. 3). “For what does the Scripture say?” Paul does not argue from experience or logic but from the text—Genesis 15:6—and this is a model for us: the final court of appeal in any theological dispute is what stands written. And the verse says exactly what Paul needs. It does not say Abraham achieved righteousness or demonstrated righteousness. It says he believed, and righteousness was logizomai—credited, posted to his account. The word is a commercial term for entering a figure in a ledger, and it appears some eleven times in this chapter (vv. 3, 4, 5, 6, 8, 9, 10, 11, 22, 23, 24). Paul is hammering one nail: righteousness comes to the believer as a credited entry, not an earned balance. Theologians call this imputation. Note carefully what is imputed and what is not: it is not that Abraham’s faith was such a fine achievement that God graciously accepted it instead of righteousness—that would make faith the one work that saves. Faith is the empty hand that receives; the righteousness credited is God’s own, revealed in the gospel (1:17; 3:21–22), and finally named in this letter as the obedience of the one man Jesus Christ (5:18–19; cf. 2 Cor. 5:21).
Wages or gift (vv. 4–5). Now Paul presses the ledger image into a workplace. Pay an employee at the end of the week and no one calls it generosity; the money is “his due”—literally, a debt owed. That is precisely why salvation cannot work that way: a God who owed us heaven would not be gracious, and we would not be saved sinners but paid contractors. Then verse 5 lands with a shock that many readers hurry past: God “justifies the ungodly.” In the Old Testament that phrase describes a corrupt judge (Prov. 17:15; Ex. 23:7). Luther was arrested by this all his life—the gospel is not that God accepts good people, but that God pronounces the ungodly righteous, and does so justly because His own Son bore their condemnation (3:24–26). Calvin puts it just as bluntly: the man who comes to God bringing nothing but faith comes as one who has nothing else to bring. This means the qualification for justification is not improvement but bankruptcy—which is why proud people find the gospel so hard and desperate people find it so sweet.
David’s testimony (vv. 6–8). Paul’s second witness quotes Psalm 32:1–2, and the choice is pointed. David wrote that psalm as a man with blood and adultery on his record; if anyone knew what it was to be justified apart from works, it was he. Notice how Paul reads it. David never uses the word “impute righteousness,” but he says God does not count sin—and Paul treats the negative and the positive as two sides of one transaction. This is the double blessing of justification: our sin is not counted against us, and a righteousness not our own is counted to us. MacArthur underlines that both halves are necessary; a debt cancelled still leaves the account at zero, and God does not merely clear the record, He credits it. And the psalm’s first word is “Blessed”—happy, to be congratulated. Forgiveness is not a grim legal technicality; it is the happiest condition a human being can be in.
An argument from the calendar (vv. 9–10). Paul’s next move is almost breathtakingly simple, and it is unanswerable: he asks when. Genesis 15 records the crediting of righteousness; Genesis 17 records the institution of circumcision. Between them lie the birth of Ishmael and roughly fourteen years—Abram was eighty-six when Ishmael was born and ninety-nine when he was circumcised. So the verdict came first and the rite came later, by more than a decade. Whatever circumcision was, it cannot have been the ground of Abraham’s acceptance, because he was already accepted. This is careful, unhurried Bible reading, and it is worth imitating: Paul answers a burning contemporary controversy by noticing the order of two chapters in Genesis. Details of the text are not trivia; they are load-bearing.
Sign and seal (v. 11). Circumcision is called two things. It is a sign—a marker pointing to a reality outside itself—and a seal, a confirmation and authentication of “the righteousness that he had by faith while he was still uncircumcised.” A seal does not create what it certifies; it certifies what already exists. Abraham did not receive righteousness by being circumcised; he received a visible confirmation of righteousness he already had. This is the historic Reformed understanding of the sacraments, drawn straight from this verse: baptism and the Lord’s Supper are God’s appointed signs and seals, given to strengthen faith’s grip on a promise already made—means of grace, never mechanisms of merit. Calvin insisted on both halves of that sentence: never despise the sign, because God gave it to help our weakness; never trust the sign, because it points away from itself to Christ. The application to our own hearts is not far off. We may not be tempted to trust circumcision, but we are perfectly capable of resting in a baptism, a membership, a raised hand at a meeting, or a family heritage. Every one of those is a sign; none of them is the righteousness.
Father of two families that are really one (vv. 11–12). Paul now shows why God ordered events this way: the purpose was to make Abraham the father of every believer, uncircumcised and circumcised alike. Because he was justified as a Gentile—an uncircumcised man—the door stands open to the nations; because he was afterward circumcised, he remains father to Jewish believers too. But notice the qualification in verse 12: he is father of the circumcised “who are not merely circumcised but who also walk in the footsteps of the faith” he had. Physical descent settles nothing. The family likeness in Abraham’s house is faith, and the mark of a true child is not a ritual on the body but a footstep in the same direction. This is the same point John the Baptist made when he warned the crowds not to say “We have Abraham as our father” (Matt. 3:9), and the point Jesus made to those who claimed the same pedigree (John 8:39). It is a searching word for any of us raised in the church: the question is never whose family we belong to, but whose faith we share.
Heir of the world (v. 13). Paul now shifts from the word “counted” to the word “promise,” and he summarizes God’s pledges to Abraham with a sweeping phrase: he would be “heir of the world.” Genesis speaks of a land, a seed, and a blessing that would reach “all the families of the earth” (Gen. 12:3); Paul reads the whole trajectory and calls it what it is—a global inheritance, ultimately fulfilled in a renewed creation shared by all Abraham’s believing children (cf. Rom. 8:17–21; Matt. 5:5). And that promise, he insists, did not come “through the law.” The observation is again chronological: the law arrived at Sinai some four hundred and thirty years after the promise (Gal. 3:17). The inheritance was pledged to faith long before the commandments existed to be kept.
Why law and promise cannot be mixed (vv. 14–15). Paul now argues that adding law to promise does not strengthen the promise—it destroys it. If the inheritance belongs to law-keepers, then “faith is null and the promise is void”: emptied of content, cancelled, made inoperative. Why? Because of what the law actually does to sinners. “The law brings wrath.” A perfect standard given to imperfect people cannot produce heirs; it can only produce transgressors and the wrath their transgressions deserve. The law is holy (7:12), but it is a mirror, not a medicine—it shows the disease with terrible accuracy and cures nothing. Luther put the point in the sharpest possible terms: the law says “do this,” and it is never done; grace says “believe this,” and everything is already done. Anyone who tries to hold both as the ground of acceptance ends up with neither.
“That it may rest on grace and be guaranteed” (v. 16). Here is one of the most pastorally precious sentences in Romans. Why does God make the inheritance depend on faith? Not arbitrarily, and not because faith is a superior virtue—but so that the promise may rest on grace and therefore be guaranteed. Trace the logic: a promise conditioned on my performance is only as secure as my performance, which is to say not secure at all; a promise resting on God’s grace is as secure as God. Faith is the only instrument that can receive a guaranteed promise, because faith contributes nothing to it. This is where assurance comes from. If you are looking for certainty in the quality of your obedience, you will oscillate between presumption and despair for the rest of your life. If your certainty rests on grace, it is as unshakeable as the character of the One who promised. And notice the reach of it: guaranteed “to all his offspring”—Jew and Gentile together, “the father of us all.”
The God who raises and creates (v. 17). Paul anchors the promise in the character of the Promiser, quoting Genesis 17:5 and then describing the God Abraham believed in with two staggering phrases. He “gives life to the dead”—which for Abraham meant a body as good as dead and a barren womb, and which for us means an empty tomb. And He “calls into existence the things that do not exist”—the God of Genesis 1, who speaks to nothing and something appears. This is the God Abraham trusted: not a God who helps those who help themselves, but a God who works where there is nothing to work with. Piper has pressed this repeatedly and rightly: faith is not a leap in the dark or a mood we generate, but a resting on the specific character of a God who is both able and utterly reliable—and that is exactly why faith glorifies Him rather than us. Luther saw the same thing from the other direction in his Heidelberg theses: God’s love does not discover something lovely and respond to it; it creates something lovely where there was nothing. Justifying the ungodly (v. 5) and calling into existence what does not exist (v. 17) are the same divine habit.
Hope against hope (v. 18). The phrase is a deliberate paradox: against every ground for hope in himself and his circumstances, Abraham hoped in God. Biblical faith is not optimism, which reads the situation and expects the best; it is confidence in a Person over against a situation that offers nothing. Abraham had one thing to go on—“So shall your offspring be” (Gen. 15:5)—a word spoken by God under a night sky full of stars, with no child in the tent. When faith has a promise, it does not need probability.
Facing the facts without weakening (vv. 19–20). Notice that Abraham’s faith was not denial. He “considered his own body, which was as good as dead… or… the barrenness of Sarah’s womb.” He looked squarely at two impossibilities and did not pretend they were otherwise, and still he did not weaken. That is a crucial pastoral correction to a popular counterfeit: faith is not refusing to name the diagnosis, the debt, or the estrangement. It is naming them honestly and then setting the promise of God beside them and finding the promise weightier. Then verse 20 makes an astonishing connection: “he grew strong in his faith as he gave glory to God.” Faith and worship feed each other. The way faith grows strong is not by straining harder to believe but by turning to consider who God is until He looms larger than the impossibility. Piper has made this the hinge of his whole treatment of the chapter: unbelief robs God of glory because it treats Him as unable or unreliable, while faith glorifies Him precisely by banking everything on His power and His word.
“Fully convinced that God was able” (vv. 21–22). Paul locates the content of saving faith with precision: not that God would do whatever Abraham wanted, but that God was able to do what He had promised. Faith is only as good as its object and only as reliable as its warrant. And verse 22 returns us to the refrain—“That is why his faith was ‘counted to him as righteousness.’” Not because his faith was a magnificent achievement that earned the credit, but because this is the kind of faith that receives a promise: empty-handed, God-focused, resting on the word of the Promiser.
Written for us (vv. 23–25). Now the chapter turns and looks straight at the reader. Genesis 15:6 was not archived for Abraham’s benefit; it was written “for ours also.” The same accounting entry is made for “us who believe in him who raised from the dead Jesus our Lord.” Observe how exactly the object of our faith matches Abraham’s: he believed in the God who gives life to the dead (v. 17), and we believe in the God who raised Jesus from the dead (v. 24). It is the same faith in the same God, now with the promise fulfilled in the open. And verse 25 gives us the two-line summary of the gospel that the whole chapter has been building toward: “delivered up for our trespasses and raised for our justification.” The cross dealt with our sin; the resurrection is God’s public receipt, His declaration that the payment was accepted and the verdict stands. Do not miss what this means for assurance: if you want to know whether God will count you righteous, look at an empty tomb outside Jerusalem. Your justification is not a hope you are working toward but a verdict already announced in history.
Big idea: Justification by faith alone is not a Pauline novelty but the way God has always dealt with sinners—Abraham was credited with righteousness while still uncircumcised and still ungodly, and David sang of the man whose sin God refuses to count. Righteousness is posted to an empty account as a gift, never paid out as wages, so that the promise rests on grace and is therefore guaranteed to everyone who shares Abraham’s faith. And that faith has always had the same object: the God who gives life to the dead, who called a nation out of a dead body and a barren womb, and who raised Jesus our Lord—delivered up for our trespasses and raised for our justification. The words “it was counted to him” were written for us.
Prayer focus: Begin by thanking God for a righteousness you did not earn and cannot lose, and confess honestly the places where you still try to pay for what has been given. Pray for anyone in the group living under a vague sense of unworthiness, that verse 8 would become personal—the Lord will not count their sin. Bring before God the impossible situations your group is facing and ask Him to be, in those places, exactly the God of verse 17. Ask that your faith would grow strong the way Abraham’s did, by giving glory to God. And close by praising Christ, delivered up and raised, whose empty tomb is the receipt for your acquittal.