Chapter 12: Covenant Theology and the Christian Life

This chapter considers two practical questions: covenant theology and the doctrine of assurance, and covenant theology and the third use of the law. Both subjects are easily misunderstood in ways that damage the Christian life. When assurance and obedience are interpreted through a monocovenantal framework, assurance is weakened and sanctification becomes legalistic. When they are placed within the law-gospel distinction, or the contrast between the Covenant of Works and the Covenant of Grace, they become central expressions of the freedom and power of the new covenant. Paul describes his apostolic ministry as a ministry of the new covenant:

God “has made us sufficient to be ministers of a new covenant, not of the letter but of the Spirit. For the letter kills, but the Spirit gives life.” —2 Corinthians 3:6

The “letter” is the law considered as an external covenant of condemnation. The Spirit gives life by uniting believers to Christ, writing the law on their hearts, and transforming them into Christ’s image. Properly understood, assurance and evangelical obedience belong together: believers obey because they are assured of their acceptance in Christ, not in order to obtain that acceptance.

Two Syllogisms of Assurance

Christian theology has traditionally discussed assurance through two related syllogisms. These are not necessarily arguments believers consciously recite step by step, but they describe the reasoning by which the conscience seeks certainty.

The Practical Syllogism

The practical syllogism proceeds as follows:

1. All who are saved display evidence of God’s grace working in their lives.
2. I see evidence of God’s grace in my life, including repentance, obedience, and good works.
3. Therefore, I am saved.

This syllogism rests on a true theological principle. It is impossible for those savingly united to Christ through effectual calling to remain wholly without the fruits of grace. James 2 distinguishes living faith from a merely verbal or dead profession, and Jesus teaches that a tree is known by its fruit. Genuine faith produces repentance, love, obedience, and a desire for holiness. Nevertheless, the practical syllogism is difficult to use as the primary basis of assurance. How much fruit is enough? How should the believer evaluate uneven growth, recurring sins, spiritual weakness, or periods of discouragement? Because sanctification is incomplete, every honest examination finds both evidence of grace and remaining corruption. When the practical syllogism is isolated from the gospel, it can become an instrument of accusation rather than comfort.

The Syllogism of Faith

The syllogism of faith proceeds differently:

1. God has promised that whoever trusts in Christ alone is certainly saved.
2. I see that I am trusting in Christ alone.
3. Therefore, I am certainly saved.

The first premise is the objective promise of the gospel. The second is the reflex act of faith: the believer recognizes that he is resting upon Christ. Assurance therefore begins outside the believer, in the certainty of God’s promise, and only then reflects upon the presence of faith.

“Whoever believes in the Son has eternal life.” —John 3:36

“Whoever hears my word and believes him who sent me has eternal life. He does not come into judgment, but has passed from death to life.” —John 5:24

“Whoever comes to me I will never cast out.” —John 6:37

The believer’s faith may be weak and mixed with unbelief, but the promise it receives is perfectly reliable. The strength of assurance rests chiefly on the truthfulness of the Promiser rather than on the strength of the believer’s introspection.

The Monocovenantal Distortion of Assurance

Within a monocovenantal framework, the syllogism of faith tends to disappear. If salvation is described as inheritance through covenant faithfulness, faith and obedience are collapsed into a single category. The practical syllogism then becomes the primary or exclusive means of assurance: the believer must determine whether his life displays enough covenant faithfulness to prove that he belongs to Christ. Paul Washer provides an example of this tendency when he writes that 1 John identifies characteristics present to some degree in every true Christian and that “to the degree that” these characteristics appear in us, we may possess assurance. The listed tests include gradual conformity to Scripture, repentance, confession, victory over sin, commandment keeping, and the practice of righteousness. Each of these is a legitimate mark of grace.

The pastoral problem arises when the believer is directed only to these marks and not first to the promise of Christ. The phrase “to the degree that” makes assurance rise and fall with the believer’s measurable success. Because every Christian’s obedience remains imperfect, assurance becomes proportionate to sanctification. The practical syllogism begins to function as a softened Covenant of Works: if one obeys sufficiently, one may enjoy the blessing of assurance; if one fails, the conscience falls again under threat. The practical syllogism has a valid secondary role. Calvin explains that the fruits of holiness do not lay the foundation of assurance but confirm it afterward:

“[The fruits of holiness] have no place in laying a foundation to strengthen the conscience but are of value only when taken a posteriori … They cannot do even this unless they first apprehend God’s goodness, sealed by nothing else than the certainty of the promise.” —John Calvin, Institutes 3.14.19

The practical syllogism is especially useful negatively. A person who professes faith while remaining settled in unrepentant rebellion should be warned that his profession is not credible. Yet the practical syllogism cannot sustain the believer’s assurance by itself. Detached from the gospel promise, “the letter kills.”

The Covenant of Grace as a Promise Covenant

Covenant theology clarifies assurance by distinguishing the Covenant of Grace from the Covenant of Works. The Covenant of Grace is most clearly revealed in the Abrahamic covenant and fulfilled in the new covenant. Paul repeatedly calls the Abrahamic covenant “the promise” and contrasts it with “the law.”

“The promise to Abraham and his offspring that he would be heir of the world did not come through the law but through the righteousness of faith. For if it is the adherents of the law who are to be the heirs, faith is null and the promise is void. For the law brings wrath.” —Romans 4:13–15

“If the inheritance comes by the law, it no longer comes by promise; but God gave it to Abraham by a promise.” —Galatians 3:18

A law covenant says, “Do this and live.” A promise covenant announces what God will accomplish and invites faith. This distinction is essential for assurance. If the inheritance depends upon our law keeping, the promise is void and the conscience remains under wrath. If the inheritance depends upon God’s promise in Christ, the believer has a sure foundation outside himself.

Abraham’s Request for Assurance

Genesis 15 presents Abraham not only as justified by faith but also as a believer seeking assurance. After believing God’s promise, Abraham asks:

“O Lord GOD, how am I to know that I shall possess it?” —Genesis 15:8

God responds by commanding Abraham to prepare the covenant animals. God then passes between the pieces and swears the oath himself. The promise was already true, but the oath was added to confirm its certainty to Abraham. Hebrews interprets this oath as an expression of God’s desire that the heirs of promise possess strong encouragement:

“When God desired to show more convincingly to the heirs of the promise the unchangeable character of his purpose, he guaranteed it with an oath, so that by two unchangeable things, in which it is impossible for God to lie, we who have fled for refuge might have strong encouragement to hold fast to the hope set before us.” —Hebrews 6:17–18

God does not reluctantly withhold assurance out of fear that confident believers will become careless. He desires to show the unchangeable character of his purpose. The promise and oath are “two unchangeable things” given to strengthen the heirs of promise.

“We desire each one of you to show the same earnestness to have the full assurance of hope until the end.” —Hebrews 6:11

“Since we have a great priest over the house of God, let us draw near with a true heart in full assurance of faith.” —Hebrews 10:21–22

Faith Lays Hold of the Promise

Faith must be defined in relation to the promise it receives. Calvin writes:

Faith is “a firm and certain knowledge of God’s benevolence toward us, founded upon the truth of the freely given promise in Christ, both revealed to our minds and sealed upon our hearts through the Holy Spirit.” —Calvin, Institutes 3.2.7

The Heidelberg Catechism likewise defines true faith as both knowledge and personal trust:

“True faith is not only a sure knowledge by which I hold as true all that God has revealed to us in his Word; it is also a wholehearted trust, which the Holy Spirit works in me by the gospel, that God has freely granted, not only to others but to me also, forgiveness of sins, eternal righteousness, and salvation. These gifts are purely of grace, only because of Christ’s merit.” —Heidelberg Catechism Q. 21

The Spirit works this trust “by the gospel,” that is, by bringing the promise of Christ home to the heart. Faith does not create the saving reality it receives. It rests upon a reality already established in Christ’s obedience, death, and resurrection.

Abraham as the Paradigm of Faith

Romans 4 repeatedly identifies Abraham as the father of believers. Paul calls him “our forefather,” “the father of all who believe,” “our father Abraham,” and “the father of us all.” Abraham’s faith therefore reveals the structure of Christian faith.

“He did not weaken in faith when he considered his own body, which was as good as dead … or when he considered the barrenness of Sarah’s womb. No unbelief made him waver concerning the promise of God, but he grew strong in his faith as he gave glory to God, fully convinced that God was able to do what he had promised.” —Romans 4:19–21

Abraham did not discover assurance by studying his own ability. His body and Sarah’s womb offered no ground for confidence. He looked away from himself to the power and faithfulness of God. Faith gives glory to God precisely because it treats his promise as more certain than every contrary circumstance. This is the proper sense in which salvation rests on covenant faithfulness—not our covenant faithfulness, but God’s covenant faithfulness in Christ. Christ fulfilled the legal condition of salvation, and his righteousness is reckoned to those who trust him.

The Fit between Promise and Faith

Promise and faith correspond to one another. A promise calls for trust, and faith is the receptive response appropriate to a promise.

“That is why it depends on faith, in order that the promise may rest on grace and be guaranteed to all his offspring.” —Romans 4:16

“Faith comes from hearing, and hearing through the word of Christ.” —Romans 10:17

The promise is preached; the Spirit works faith through that proclamation; and faith receives what the promise offers. This relation between promise and faith becomes the primary basis of assurance. Assurance is closely related to faith because faith itself contains a seed of assurance. To believe a promise is to regard the Promiser as trustworthy. Nevertheless, this does not mean that every genuine believer enjoys unwavering full assurance. Faith remains imperfect and may cry, “I believe; help my unbelief.” Sanctification is also incomplete, so the believer may struggle to recognize the fruits of grace. Assurance grows as weak faith repeatedly returns to the strong promise.

The Primary and Reflex Acts of Faith

The primary act of faith is the direct act of trusting Christ. Through effectual calling, the Spirit brings the sinner to rest upon Christ for salvation. The reflex act of faith occurs when the believer reflects upon that trust and recognizes, “I see that I am relying upon Christ.” The reflex act supplies the second premise in the syllogism of faith, but it does not replace the gospel promise as the foundation of assurance. The believer is not saved because he has inspected his faith and found it sufficiently strong. He is saved because Christ is sufficient and has promised to receive everyone who comes to him. The Christian life is therefore characterized by a continual coming to Christ, not merely by remembering a single past decision. The Heidelberg Catechism describes the preaching of the gospel as repeatedly opening the kingdom:

“The kingdom of heaven is opened by proclaiming and publicly declaring to all believers, each and every one, that, as often as they accept the gospel promise in true faith, God, because of Christ’s merit, truly forgives all their sins.” —Heidelberg Catechism Q. 84

The words “as often as” are pastorally important. The gospel is not only for initial conversion. Believers return to it whenever conscience accuses, sin burdens, or faith weakens. Public confession and the assurance of pardon in worship repeatedly direct the church back to Christ. A believer’s sins and shortcomings do not disqualify him from the promise; they identify him as the kind of person to whom the promise is addressed.

“Come to me, all who labor and are heavy laden, and I will give you rest.” —Matthew 11:28

Faith Is Not Momentary Mental Assent

The syllogism of faith must be distinguished from so-called “Free Grace” theology. Saving faith is not a momentary flash of mental assent that may disappear permanently while guaranteeing salvation regardless of later apostasy. The gospel promise is not “whoever once appeared to believe for a moment has eternal life.” It is addressed to those who believe and continue to come to Christ. This does not make perseverance a meritorious work. God preserves his saints by preserving them in faith. True faith is a wholehearted trust produced by the Spirit through the gospel, and believers persevere because Christ keeps them.

“We have come to share in Christ, if indeed we hold our original confidence firm to the end.” —Hebrews 3:14

The alternative to easy-believism is not justification by obedient faith. It is a richer biblical doctrine of faith as continuing reliance upon Christ, accompanied by the inevitable fruits of repentance and obedience.

Is the Covenant of Grace Conditional?

The Covenant of Grace may be called conditional, provided the condition is carefully defined. Christ alone fulfills the legal conditions necessary to merit salvation. Yet sinners are commanded to believe, and faith is the means by which they are united to Christ and receive his benefits. Faith is a unique covenant condition for two reasons. First, faith is receptive rather than productive. It is the empty hand that receives Christ rather than a work that earns the promise. Second, faith itself is one of the blessings God promises to give in the Covenant of Grace.

“The grace of God is manifested in the second covenant, in that he freely provides and offers to sinners a mediator, and life and salvation by him; and requiring faith as the condition to interest them in him, promises and gives his Holy Spirit to all his elect, to work in them that faith, with all other saving graces; and to enable them unto all holy obedience, as the evidence of the truth of their faith and thankfulness to God.” —Westminster Larger Catechism Q. 32

The Covenant of Grace is unlike the Covenant of Works at precisely this point. Adam was required to render obedience, but God did not promise to perform that obedience in Adam. In the Covenant of Grace, God not only provides Christ and salvation but also gives the faith by which the elect receive Christ. Holy obedience follows as evidence and gratitude, not as the means of acquiring the inheritance.

Obedience for Assurance or Assurance for Obedience?

The difference between the two systems can be stated simply.

Obedience for Assurance

The legalistic pattern says: if you obey, God will bless you with assurance. The believer studies his sanctification to determine whether he has earned the right to feel secure. Even when this is not described as strict merit, it reproduces the bondage of a works covenant. The conscience remains dependent on performance.

Assurance for Obedience

The evangelical pattern says: you are blessed and accepted in Christ; therefore, obey. Assurance does not weaken holiness. It supplies the freedom, gratitude, and spiritual strength from which true holiness grows.

“Because I belong to him, Christ, by his Holy Spirit, also assures me of eternal life and makes me wholeheartedly willing and ready from now on to live for him.” —Heidelberg Catechism Q. 1

The order is decisive. Christ assures the believer of eternal life, and that assurance makes him willing and ready to live for Christ. This is the ministry of the Spirit rather than the ministry of the condemning letter.

Q&A on Assurance

Dispensationalism and the Abrahamic Promise

Many Christians who emphasize the practical syllogism do not consciously hold a developed monocovenantal theology. Their background may be dispensational or broadly evangelical, and the categories of Covenant of Works, Covenant of Grace, law, promise, and republication may be largely absent. Dispensationalism’s separation of the Abrahamic covenant from the church contributes to this problem. If the Abrahamic covenant is reduced to a national land promise for ethnic Israel, the clearest biblical exposition of promise and faith is removed from Christian experience. Romans 4, however, treats Abraham directly as the father and paradigm of Christian believers. Paul expressly says that the account of righteousness being credited to Abraham was written “for our sake also” (Rom. 4:23–25).

Limited Atonement and the Gospel Promise

A Lutheran objection sometimes claims that Reformed believers cannot use the syllogism of faith because particular redemption prevents them from knowing that Christ died for them. The gospel promise, however, is not an unconditional declaration to every individual that “Christ died for you.” It is the universal and sincere promise that everyone who believes in the Son has eternal life. Those who believe may therefore know that Christ died for them. The free offer of the gospel is fully compatible with election and particular redemption. The gospel is preached to all, and all are commanded to believe. Reformed theology adds that the Spirit grants saving faith to the elect.

The Practical Syllogism against Satan’s Accusations

Satan is the accuser of the brethren and commonly attacks believers by directing attention to their sin, weakness, and inconsistency. If assurance rests only on the practical syllogism, the accusation has considerable force. The decisive answer is the promise of the gospel: Christ receives sinners who trust him, his righteousness is sufficient, and there is no condemnation for those who are in him. The practical syllogism may still confirm assurance, but it must remain joined to the syllogism of faith. A believer may see that gospel assurance produces sorrow for sin, repentance, perseverance, and a renewed desire to obey. The fruit confirms the living character of faith; it does not replace Christ’s promise.

Fruit, Christian Subculture, and False Comparisons

Spiritual fruit must not be confused with conformity to the customs of a Christian subculture. Attendance at numerous meetings, particular educational choices, abstention from activities a community dislikes, or visible religious busyness may reflect cultural expectations rather than the fruit of the Spirit. True fruit includes love, joy, peace, patience, humility, repentance, and increasing Christlikeness. It also appears differently in believers with different histories, weaknesses, and temptations. Comparing one person’s particular struggles with another’s apparent strengths easily produces pride or despair. The law is spiritual and searches the heart; outward respectability may coexist with deep idolatry. The practical syllogism therefore requires sober, charitable, and gospel-centered use. It is appropriate both for self-examination and for evaluating a credible profession in church discipline, but it cannot measure grace by superficial social standards.

The Threefold Division of the Law

Reformed theology traditionally distinguishes the moral, civil, and ceremonial laws. The moral law expresses God’s unchanging ethical will and is summarized in the Ten Commandments. The civil law governed Israel as a covenant nation, including its judicial penalties. The ceremonial law regulated sacrifices, priesthood, purity, and other types fulfilled in Christ. The ceremonial law has reached its fulfillment and is no longer binding in its old-covenant form. The civil law has also expired with Israel’s national polity, though its general equity remains instructive. The moral law continues to bind all people because it is rooted in God’s holy nature and in humanity’s creation in his image. Even the Decalogue includes covenantal and ceremonial features. The fourth commandment, for example, contains the permanent moral principle that time must be set apart for worship, while its specification of the seventh day belongs to the old-covenant administration. The distinction between enduring moral substance and historical covenantal form is therefore necessary.

The Three Uses of the Law

“We know that the law is good, if one uses it lawfully.” —1 Timothy 1:8

The first use of the law is the mirror. It exposes sin, silences self-righteousness, and drives sinners to Christ. The second use is the curb. Through conscience and civil restraint, the law limits outward wickedness in society. God’s common grace preserves a knowledge of right and wrong even among fallen people. The third use is the rule of life for believers. Calvin calls it the principal use because it addresses believers in whom the Spirit dwells. Westminster Confession 19.6 describes the law as a rule of life that informs believers of God’s will and directs and binds them to walk accordingly. Theologians therefore call the third use the normative or didactic use. It is not a means of obtaining salvation, justification, or assurance. It teaches those who are already accepted in Christ how they should live.

The Same Moral Law in Different Covenantal Forms

The moral law is eternal because it reflects God’s unchanging holiness. Its substance does not change, yet it comes to humanity in different covenantal forms. The Marrow of Modern Divinity expresses the distinction this way:

“Though the law of Christ, in regard of the substance and matter, be all one with the law of works, yet their forms do differ.”

The moral content required of Adam and of believers is the same: love for God and neighbor, expressed in the commandments. The covenantal administration is different. In the Covenant of Works, the law comes in legal form with life promised for perfect obedience and death threatened for disobedience. In the new covenant, the same moral law comes in gospel form from the hand of Christ to those whose justification and life are already secured. The distinction is not between a severe Old Testament ethic and a relaxed New Testament ethic. It is between the law as a covenant of works and the law as a rule of grateful life within the Covenant of Grace.

The Mosaic Law in the Form of a Covenant of Works

The moral law at Sinai was embedded in a typological covenant of works with Israel as a nation. Israel was promised temporal blessing and continued possession of the land for national obedience and threatened with curse and exile for disobedience. The thunder, trumpet, fear, blessings, and curses of the Sinai covenant displayed the law’s condemning legal form. This national arrangement did not offer eternal salvation to individual Israelites through works. In its broader administration, the Mosaic covenant also communicated the Covenant of Grace through promises, sacrifices, and types. Yet in its narrow, typological aspect, it republished the works principle and prepared for Christ, the obedient Israelite and second Adam.

Believers Have Died to the Law as a Covenant of Works

Paul teaches that believers have died to the law through their union with Christ.

“You also have died to the law through the body of Christ, so that you may belong to another, to him who has been raised from the dead, in order that we may bear fruit for God.” —Romans 7:4

Christ was born under the law, rendered the obedience it demanded, and bore its curse for his people.

“Christ redeemed us from the curse of the law by becoming a curse for us.” —Galatians 3:13

To be dead to the law does not mean that believers are free to violate God’s moral will. It means that the law no longer stands over them as the covenant by which they must be justified or condemned. Christ has exhausted its curse and fulfilled its demand on their behalf.

The Law from the Hand of Christ

The moral law is neither erased nor abolished. It is rooted in God’s nature and binds all human beings as his image-bearers. Believers, however, receive it within a new covenantal relationship. They are not under the law as a Covenant of Works but are bound to it as the law of Christ, delivered by the Savior who has already fulfilled it for them. Westminster Confession 19.6 summarizes both sides of this truth: true believers are not under the law as a covenant of works, to be justified or condemned by it, yet the law remains of great use as a rule of life that directs and binds them to obedience.

Does This Diminish the Law’s Authority?

Receiving the law from Christ’s hand does not weaken its divine authority. Christ is the eternal Son of God. His gospel does not dissolve the Creator’s moral demands but strengthens the believer’s obligation through redemption and union with him.

“The moral law doth forever bind all, as well justified persons as others, to the obedience thereof … Neither doth Christ, in the gospel, any way dissolve, but much strengthen this obligation.” —Westminster Confession of Faith 19.5

Grace does not make obedience optional. Those purchased by Christ belong to him in body and soul. Their obligation is heightened, not lessened, because they have been redeemed from bondage and consecrated to his service.

Does This Change the Content of the Moral Law?

The content of the moral law cannot change because God’s holy nature does not change. The law of Christ directs believers to the same moral obedience summarized in the Decalogue. The difference lies not in the commandments themselves but in the covenantal setting, the believer’s standing, and the motive for obedience. The Marrow of Modern Divinity explains that the law of Christ is materially the same as the law of works, whose moral substance is scattered throughout Scripture and summarized in the Ten Commandments. Evangelical grace does not direct believers to a different morality; it directs them to the same holy standard from within the security of Christ’s completed work. Ernest Kevan concluded that the phrase “the law in the hands of Christ” is not antinomian when both antinomianism and neonomianism are avoided. It implies no reduction in the law’s demands or binding authority. It signifies a different administration and a deeper motive arising from the believer’s experience of Christ.

The Monocovenantal View of the Third Use

Monocovenantalism lacks a clear distinction between the law as a covenant of works and the law as a rule of life. It also blurs the difference between faith and the obedience that flows from faith. Faith becomes “faithfulness,” and the third use begins to function as a milder continuation of the works principle. The problem is not a strong doctrine of obedience. The problem is the covenantal role assigned to obedience. When obedience becomes the means of obtaining acceptance or assurance, the believer is effectively placed again under “Do this and live.” The new covenant order is instead: “Because you live in Christ, do this.”

Dead to the Law in Order to Live to God

John Colquhoun describes freedom from the law as both the believer’s privilege and duty:

“It is the inestimable privilege, as well as the indispensable duty, of all who have believed through grace to be dead to the law as a covenant of works.” —John Colquhoun, A Treatise on the Law and the Gospel

Colquhoun argues that living unto God according to the law as a rule in the Mediator’s hand is the fruit of having died to the law as a covenant. Unless the believer is dead to the law as the ground of life and acceptance, genuine evangelical obedience is impossible. Legal fear may produce outward conformity, but it cannot produce the grateful fruit God desires. This point unites the lecture’s two topics. Obedience pursued in order to gain assurance is slavish and self-protective. Obedience flowing from assurance is free, grateful, and directed toward God’s glory. The believer mortifies sin not to persuade God to accept him but because God has already accepted him in Christ.

Freedom from the Law without Antinomianism

Paul makes several strong statements about Christian freedom:

“You are not under law but under grace.” —Romans 6:14

“If you are led by the Spirit, you are not under the law.” —Galatians 5:18

These statements do not abolish the moral law. They announce freedom from the law as a covenant of works. Samuel Bolton explains the distinction:

“The law may be considered as a rule and as a covenant. When we read that the law is still in force, it is to be understood of the law as a rule, not as a covenant. Again, when we read that the law is abrogated, and that we are freed from the law, it is to be understood of the law as a covenant, not as a rule.” —Samuel Bolton, The True Bounds of Christian Freedom

This distinction allows the church to affirm everything Paul says about release from the law without falling into antinomianism. The believer is fully free from the law’s covenantal condemnation and fully bound to God’s moral will as the grateful servant of Christ.

Romans 7: Dying to the Law and Bearing Fruit

Paul illustrates the believer’s release from the law through the analogy of marriage. Death ends the old legal bond and permits union with another.

“You also have died to the law through the body of Christ, so that you may belong to another, to him who has been raised from the dead, in order that we may bear fruit for God.” —Romans 7:4

The order is striking. Believers must die to the law in order to bear fruit for God. Union with the risen Christ, not the pressure of the condemning law, produces holiness. As branches joined to the vine, believers become fruitful through the life of Christ within them.

“While we were living in the flesh, our sinful passions, aroused by the law, were at work in our members to bear fruit for death. But now we are released from the law, having died to that which held us captive, so that we serve in the new way of the Spirit and not in the old way of the written code.” —Romans 7:5–6

The law as condemning letter arouses sinful resistance and bears fruit for death. Release from that covenantal bondage makes possible service in the new way of the Spirit. This is the same letter-Spirit contrast with which the lecture began in 2 Corinthians 3.

Romans 8 and the New-Covenant Work of the Spirit

Romans 8 presents sanctification as the result of Christ’s saving work and the indwelling Spirit, not as the achievement of the law acting upon the flesh.

“There is therefore now no condemnation for those who are in Christ Jesus. For the law of the Spirit of life has set you free in Christ Jesus from the law of sin and death. For God has done what the law, weakened by the flesh, could not do.” —Romans 8:1–3

God condemned sin in Christ so that the law’s righteous requirement might be fulfilled in those who walk according to the Spirit. The Christian life therefore begins with “no condemnation” and proceeds through the Spirit’s power. It does not begin with the threat of condemnation and hope that obedience will eventually remove it. Paul is drawing upon the promises of the new covenant:

“I will put my law within them, and I will write it on their hearts.” —Jeremiah 31:33

“I will put my Spirit within you, and cause you to walk in my statutes.” —Ezekiel 36:27

The Covenant of Works commands obedience but does not provide the power to fulfill its demand. The new covenant gives Christ, forgiveness, the Spirit, a new heart, and the inward desire to walk in God’s ways. The third use of the law belongs within this new-covenant reality.

What It Means to Walk in the Spirit

Walking in the Spirit is not an ecstatic state or a collection of extraordinary religious experiences. It is the ordinary new-covenant life in which faith receives Christ, assurance grows through the gospel, and the Spirit uses that assurance to strengthen repentance and obedience. The believer sees his sin, returns to Christ, receives again the promise of forgiveness, and rises to continue the struggle. He begins to delight in God’s will, grieves over disobedience, and seeks conformity to the law written on his heart. This process is the gospel’s power at work through the Spirit.

“The righteous requirement of the law [is] fulfilled in us, who walk not according to the flesh but according to the Spirit.” —Romans 8:4

Sanctification is therefore not accomplished by placing the believer back under the law as a covenant. The same Christ who justifies also sanctifies. The gospel that grants a righteous standing also gives the Spirit, renews the heart, and produces evangelical obedience.

Q&A on the Third Use

Does the Reformed Third Use Smuggle Legalism Back into the Gospel?

The charge has force against distorted forms of Reformed preaching. A preacher may affirm justification by faith alone and then treat sanctification as though it were produced chiefly by legal pressure, threats, and performance. This creates an unstable formula: justification by the gospel, followed by sanctification by the law. Authentic Reformed theology does not teach sanctification by the law considered in isolation. The law directs sanctification by revealing God’s will, but Christ and the Spirit produce sanctification through the gospel. Believers must be dead to the law as a covenant of works in order to bear fruit for God. The third use becomes legalistic whenever it is detached from this covenantal and gospel-centered context. A merely abstract affirmation of the Covenant of Works and Christ’s active obedience is not enough. These doctrines must be connected to the biblical movement from Abrahamic promise, through Mosaic law, to new-covenant fulfillment. Otherwise passages such as Romans 7:1–6 are neglected, and the practical freedom of dying to the law is lost.

Are We Justified by Faith but Sanctified by Works?

No. Good works are necessary in sanctification, but they are not an independent power that sanctifies. Believers work because God works in them. They obey through union with Christ, the indwelling Spirit, the means of grace, and continual reliance upon the gospel. The law provides the normative shape of holiness; it does not provide the life that creates holiness. Christ is both our righteousness and our sanctification. The gospel is not left behind after conversion but continually renews the believer’s faith, assurance, gratitude, and strength for obedience.

How Should Romans 8:13 and Galatians 6:8 Be Understood?

Some Pauline warnings sound like a renewed works principle:

“If you live according to the flesh you will die, but if by the Spirit you put to death the deeds of the body, you will live.” —Romans 8:13

“The one who sows to his own flesh will from the flesh reap corruption, but the one who sows to the Spirit will from the Spirit reap eternal life.” —Galatians 6:8

Read in isolation, these statements may appear to teach that justified believers retain salvation by sufficient obedience. Their broader context shows instead that Paul is applying the practical syllogism as a warning. Persistent, unrepentant life according to the flesh reveals that a person does not belong to Christ. Spirit-wrought mortification is evidence of sonship, not the meritorious ground of life. The next verse in Romans explains the relationship:

“All who are led by the Spirit of God are sons of God.” —Romans 8:14

Paul does not say that mortification earns adoption. He says that those who are sons are led by the Spirit and therefore put sin to death. Galatians makes the same point. Those who practice the works of the flesh without repentance will not inherit the kingdom, while those who belong to Christ have crucified the flesh with its passions and desires.

“Those who belong to Christ Jesus have crucified the flesh with its passions and desires.” —Galatians 5:24

This crucifixion is definitive and judicial through union with Christ, yet it produces an ongoing conflict with remaining sin. Paul cannot mean that the flesh has been eradicated, since he has just described the continuing opposition between flesh and Spirit. Believers struggle because the flesh has been condemned in principle and must now be progressively mortified by the Spirit. These warnings therefore retain their full seriousness without becoming a Covenant of Works. They expose false profession, summon believers to Spirit-enabled mortification, and describe the necessary fruit of belonging to Christ.

Conclusion

Covenant theology clarifies the Christian life by preserving the proper order of gospel and obedience. The Covenant of Grace is a promise covenant. Faith receives its blessings by looking away from self to Christ, and the certainty of God’s promise supplies the primary foundation of assurance. The fruits of grace confirm faith secondarily but cannot bear the full weight of the conscience. The same covenantal order governs the third use of the law. Believers have died to the law as a covenant of works and now receive the unchanged moral law from the hand of Christ as their rule of life. They do not obey in order to obtain life, preserve justification, or manufacture assurance. Because they possess life and assurance in Christ, the Spirit makes them willing and ready to obey. The contrast may therefore be stated in two formulas:

• Obedience for assurance: If you obey, you may be blessed and accepted.
• Assurance for obedience: You are blessed and accepted in Christ; therefore, obey.

The first reproduces the bondage of the Covenant of Works. The second expresses the heart of the Covenant of Grace and the new covenant: the letter kills, but the Spirit gives life. The law is written on the heart, the Spirit causes God’s people to walk in his statutes, and gospel assurance produces the grateful holiness God desires.