This session of the Catechism turns our attention to the law of God and its place in the life of the Christian. After establishing foundational truths about God’s nature, His work in Christ, the reality of sin, the covenant of grace, and redemption through Christ, the Catechism naturally progresses to the question of how the redeemed are to live. The focus now is not on how one is saved, but on how one lives as someone already saved.
A key question arises: are New Testament believers still obligated to obey God’s law? Scripture declares in Romans 6:14 that believers are “not under law but under grace.” This does not abolish the moral law but clarifies its function. Christians are no longer under the law as a covenant of works—meaning the law no longer condemns those who are in Christ, for He has fulfilled it on their behalf. Rather, the law now serves as a guide for living a life shaped by grace.
Historically, the Church has recognized three uses of the law. First, the law acts as a mirror. It exposes sin and reveals our inability to attain righteousness by our own efforts, as seen in Romans 3:20. It shows us our need for a Savior and humbles us before God. A common distortion, especially in certain contemporary teachings, is to emphasize only this aspect of the law, resulting in a Christian life that seeks freedom from the law without a corresponding desire to obey it.
Second, the law functions as a restraint against evil. It curbs outward sin in society and restrains even believers who continue to wrestle with indwelling sin. By revealing what God forbids, the law upholds God’s holiness and highlights humanity’s need for His grace. Even those who do not belong to Christ are, in a general sense, restrained by the moral standards revealed in the law.
Third, the law guides believers in grateful obedience. Those who have been redeemed by Christ are not freed from obedience but freed for obedience. The law no longer serves as a means to earn salvation but as a pattern for expressing love and gratitude to God. Obedience, therefore, is no longer driven by fear of condemnation but by joy and thankfulness. Empowered by the Holy Spirit, believers are enabled to reflect Christ in their lives. As Jesus teaches in John 14:15, love for Him is expressed through keeping His commandments. Likewise, Romans 3:31 affirms that faith does not nullify the law but establishes it.
In approaching the law, it is important to avoid two extremes. Legalism insists that obedience earns acceptance before God, while antinomianism dismisses the need for obedience altogether. Both distort the gospel. The Christian life flows from grace to gratitude. We obey not to be accepted, but because we have already been accepted in Christ. Our obedience is a response to the redemption we have received.
Jesus summarized the entire law in two commandments: love for God with all one’s heart, soul, and mind, and love for one’s neighbor as oneself (Matthew 22:37–39). These two commands form the foundation of the Ten Commandments. The first four commandments direct our love toward God, while the remaining six direct our love toward others. Without this framework of love, the law becomes mere rule-keeping rather than the expression of a covenant relationship.
This relational foundation is evident in Exodus 20:1–2, where God declares that He is the one who brought His people out of Egypt. The commandments are given not as a means of becoming God’s people, but because they already are His people. Obedience flows from redemption, not toward it.
The moral law itself reflects God’s revealed will. It was formally given through Moses, but its principles were already written on the human heart, as Romans 2 indicates. Unlike ceremonial or civil laws specific to Israel, the moral law is universal and enduring, rooted in God’s unchanging character. The Ten Commandments, personally inscribed by God, summarize this moral law and carry His authority for all people.
The commandments are best understood through the lens of love. The first commandment calls for exclusive devotion to God, warning against placing anything else in His rightful place, whether idols or “functional gods” like success, wealth, or personal desires. The second commandment addresses the manner of worship, prohibiting the creation of images or self-designed forms of worship, and calling believers to worship God as He has revealed in His Word. God is Spirit, and He must be worshipped in spirit and truth, not according to human invention.
The third commandment requires reverence for God’s name. This includes not only avoiding careless or irreverent speech, but also honoring God in how His name and truth are represented. Misusing God’s name includes treating it lightly, making false claims of divine direction, or using religion for personal gain.
The fourth commandment calls for the setting apart of a day for the worship of God. While Christians observe the Lord’s Day in light of Christ’s resurrection, the principle remains that time should be intentionally devoted to God. This rhythm of rest and worship reflects both dependence on God and a pattern for spiritual renewal.
The last six commandments direct our love toward others. The fifth commandment calls for honoring parents and all rightful authorities, recognizing that such respect contributes to the stability of society and reflects submission to God’s order. The sixth commandment upholds the sanctity of life, extending beyond physical harm to include attitudes and actions that damage others emotionally or relationally. The seventh commandment upholds purity in relationships, guarding the sanctity of marriage and forbidding all forms of sexual immorality, whether in action, thought, or desire.
The eighth commandment calls for honesty and integrity in all matters of possession and stewardship, forbidding theft, fraud, and misuse of resources, while encouraging generosity and faithful stewardship. The ninth commandment demands truthfulness, protecting the reputation of others and forbidding lies, gossip, and misrepresentation. The tenth commandment addresses the heart, exposing covetousness and discontentment. It reveals that sin is not only outward but deeply internal, rooted in the desires of the heart.
In examining the law, it becomes clear that no one is able to perfectly keep it. Scripture affirms that all have sinned and fall short of God’s glory. While all sin is serious, not all sins are equally severe, and some carry greater consequences than others. Yet every sin ultimately deserves God’s judgment and wrath. This sobering reality highlights the necessity of the gospel. The law exposes our need, but it is Christ who fulfills the law on our behalf and provides forgiveness through His death and resurrection.
Even for believers, the law remains significant. It reveals the character of God, preventing a shallow understanding of grace. It defines what true love looks like, ensuring that love is not merely subjective. It guides the process of sanctification, shaping believers into Christ’s likeness through the work of the Holy Spirit. It exposes ongoing sin, keeping believers humble and dependent. And most importantly, it continually drives believers back to Christ, deepening their appreciation of His finished work.
Ultimately, the Christian life is not a journey of earning favor with God, but of responding to the grace already received. The law no longer condemns those in Christ, but it continues to instruct, correct, and guide them. As believers grow in understanding the law, they grow in understanding their need for Christ—and in turn, grow in their love for Him. The goal is not perfection in ourselves, but faithful reliance on the One who has perfectly fulfilled the law on our behalf.
