The Moral Law as God’s Holy Will for All Mankind: WLC Question 93

Question 92 of the Westminster Larger Catechism talked about the importance of the moral law that was given to Adam. But this brings up an important follow-up question: “What is the moral law?” This is what question 93 asks. It answers by saying:

“The moral law is the declaration of the will of God to mankind, directing and binding every person to personal, perfect, and perpetual conformity and obedience to it, in the orientation and disposition of the whole person, soul and body, along with the performance of all those duties of holiness and righteousness that each person owes to God and other people. It is accompanied by the promise of life if they fulfill it and the threat of death if they break it.”

That is a full answer, but it is also a practical one. The moral law is not merely a list of religious rules. It is God’s holy will revealed to mankind. It reveals to us what righteousness looks like, what God requires, and why every sinner needs Christ.

The Moral Law Declares God’s Will

The catechism begins by saying that the moral law is “the declaration of the will of God to mankind.” This means the moral law does not come from human opinion, cultural preference, or personal feeling. It comes from God himself.

In Deuteronomy 5, Moses calls Israel to listen carefully to the Lord’s commands: “Hear, O Israel, the statutes and the rules that I speak in your hearing today, and you shall learn them and be careful to do them” (Deut. 5:1). God’s law was not given merely to be known. It was given to be heard, learned, loved, and obeyed.

This matters because we do not stand over God’s law as judges. We stand under it as creatures before our Creator. The moral law declares the will of the holy God, and because God is holy, his law is holy.

The Moral Law Binds Every Person

The catechism says that the moral law directs and binds “every person.” God’s moral will is not limited to one nation, one culture, or one period of history. Every person owes obedience to God because every person belongs to God.

That is one reason the moral law exposes our guilt. Galatians 3:10 says, “Cursed be everyone who does not abide by all things written in the Book of the Law, and do them.” The law does not ask whether we tried hard, meant well, or did better than someone else. It requires full obedience.

This is sobering, but it is also clarifying. Our greatest problem is not that we make mistakes. Our greatest problem is that we have sinned against the God whose will is revealed in his moral law.

The Moral Law Requires Perfect Obedience

The catechism says the moral law requires “personal, perfect, and perpetual” obedience.

It requires personal obedience. Each person is accountable before God.

It requires perfect obedience. God’s standard is not partial righteousness, but complete conformity to his will.

It requires perpetual obedience. God does not require holiness only at certain times, but throughout the whole course of life.

Romans 10:5 says, “The person who does the commandments shall live by them.” Galatians 3:12 says, “The one who does them shall live by them.” The law promises life to those who obey it, but that obedience must be complete and continuing. This is why sinners cannot be justified by the law. The law is good, but we have not kept it.

The Moral Law Reaches the Whole Person

The moral law is not concerned only with outward behavior. The catechism says it requires obedience “in the orientation and disposition of the whole person, soul and body.” God’s law reaches our actions, but also our thoughts, motives, desires, loves, and affections.

Jesus shows this in Luke 10:26–27. When asked about eternal life, he points to the law. The answer given is, “You shall love the Lord your God with all your heart and with all your soul and with all your strength and with all your mind, and your neighbor as yourself.”

That is the depth of the moral law. God does not merely require outward conformity. He requires love from the whole person. True obedience is not mechanical. It is a wholehearted devotion to God.

This means we cannot measure holiness only by what others see. God’s law asks not only, “What did you do?” but also, “What did you love? What ruled your heart?”

The Moral Law Teaches Our Duty to God and Neighbor

The moral law requires “all those duties of holiness and righteousness that each person owes to God and other people.” This follows the basic pattern of the Ten Commandments and the summary Jesus gives in Luke 10.

We owe holiness to God. We are to worship him alone, honor his name, trust his Word, obey his commands, and live before him with reverence and love. Luke 1:75 speaks of serving God “in holiness and righteousness before him all our days.”

We also owe righteousness to other people. God’s law governs how we treat parents, spouses, children, neighbors, enemies, authorities, and all those around us. Paul gives a helpful summary in Acts 24:16: “So I always take pains to have a clear conscience toward both God and man.”

That is a searching way to think about obedience. Do I have a clear conscience before God? Do I have a clear conscience toward others? Have I loved God rightly? Have I treated my neighbor righteously?

The Moral Law Shows Our Need for Christ

The moral law is good, but it cannot save sinners by our obedience. Instead, it shows us our need for Christ. If the law requires personal, perfect, and perpetual obedience, then we must confess that we have not given God what he requires.

But Christ has.

Jesus loved the Father with all his heart, soul, mind, and strength. He loved his neighbor perfectly. He obeyed personally, perfectly, and perpetually. He fulfilled all righteousness.

Then, on the cross, he bore the curse of the law for his people. Galatians 3:10 reminds us that the law pronounces a curse on all who fail to obey it fully. The gospel tells us that Christ redeemed sinners from that curse by bearing it in their place.

So the moral law humbles us, but it does not leave believers hopeless. It drives us to Christ for righteousness, forgiveness, and life.

The Moral Law and the Christian Life

For the Christian, the moral law is not a ladder by which we climb into God’s favor. Christ is our righteousness. We are accepted by grace through faith, not by works of the law.

Yet the moral law remains a holy guide for the life of gratitude and obedience. It teaches us what pleases God. It exposes remaining sin. It directs us in love.

That is why Paul prays in 1 Thessalonians 5:23, “Now may the God of peace himself sanctify you completely.” The Christian life is not a partial transformation. God is at work to sanctify the whole person.

The moral law shows us what holiness looks like.

Living Before God According to the Moral Law

The moral law is the declaration of God’s will for mankind. It binds every person to personal, perfect, and perpetual obedience. It reaches the whole person, soul and body. It teaches our duty to God and neighbor. It promises life to those who keep it and warns of death to those who break it.

But most importantly, it points sinners to Christ.

When we see the holiness of God’s law, we should not pretend we have kept it well enough. We should confess our sin and flee to the Savior who fulfilled the law for us. Then, resting in his grace, we seek to walk in obedience—not to earn life, but because in Christ we have already received it.

Soli Deo Gloria