The Duty God Requires: Obedience to His Revealed Will (WLC 91)

The Westminster Larger Catechism begins its third major section with a simple but searching question: “What is the duty that God requires of mankind?” The answer is equally clear: “The duty that God requires of mankind is obedience to his revealed will.” The answer may be brief, but it opens a wide door. The catechism has already taught us what we must believe concerning God. Now it begins to teach us what we are called to do. Doctrine is never meant to remain only in the mind. Truth is meant to shape worship, love, obedience, and daily life.

God has revealed himself. God has spoken. And because God has spoken, mankind has a duty before him: obedience to his revealed will. We do not have the authority to decide for ourselves what pleases God. We cannot invent worship, create our own standard of righteousness, or treat our preferences as if they were God’s commands. The duty God requires is obedience to what he has made known.

The Duty God Requires Is Revealed in His Word

The catechism does not say that the duty God requires is obedience to our feelings, our traditions, or our best guesses. It says God requires obedience to his revealed will. This is one of the great kindnesses of God. He has not left us to wander in darkness, trying to imagine what obedience might look like. He has given us his Word. Scripture shows us who God is, what he has done, what he commands, what he forbids, what he promises, and what he loves.

That means the Christian life begins with humble listening. Before we speak, we listen. Before we act, we submit. Before we ask, “What do I want?” we ask, “What has God said?” Obedience to God’s revealed will is not blind obedience. It is obedience grounded in God’s own self-disclosure. We obey because the Lord has spoken.

The Duty God Requires Is Whole-Life Worship

Romans 12:1 says, “I appeal to you therefore, brothers, by the mercies of God, to present your bodies as a living sacrifice.” Paul is not describing a narrow or occasional obedience. He is calling for the whole person to be offered to God. The duty God requires reaches all of life: our words, thoughts, priorities, homes, work, habits, and conduct. The Christian is not his own, because he belongs to God.

Paul calls this “your spiritual worship.” Obedience is not merely external rule-keeping; it is grateful worship before the Lord. This keeps us from two errors. First, it keeps us from empty religion because God is not pleased with outward acts disconnected from faith, humility, and love. Second, it keeps us from vague spirituality, because true devotion to God takes shape in real obedience. We do not honor God merely by saying that we love him. We honor him by hearing his Word and submitting ourselves to it.

Romans 12:2 continues, “Do not be conformed to this world, but be transformed by the renewal of your mind.” Obedience to God’s revealed will requires a renewed mind. The world is always discipling us. It teaches us what to desire, what to fear, what to celebrate, and what to ignore. If we are not being shaped by the Word of God, we will be shaped by the spirit of the age.

This means obedience requires more than behavior modification. We need transformation. The Word of God renews the mind and teaches us to see God rightly, ourselves honestly, sin soberly, and Christ as precious. As our minds are renewed by Scripture, we learn to discern “what is the will of God, what is good and acceptable and perfect.” A renewed mind does not ask, “Can I get away with this?” It asks, “Does this honor the Lord?” It does not ask, “What does everyone else think?” It asks, “What has God said?”

The Duty God Requires Is Better Than Empty Religion

In 1 Samuel 15:22, Samuel says to King Saul, “Has the LORD as great delight in burnt offerings and sacrifices, as in obeying the voice of the LORD? Behold, to obey is better than sacrifice, and to listen than the fat of rams.” Saul had disobeyed God’s command, but he tried to cover his disobedience with religious language. He claimed that the animals he spared were intended for sacrifice. But Samuel exposed the truth: God does not accept religious performance as a substitute for obedience.

That warning is still needed. It is possible to be busy with religious activity while resisting the revealed will of God. It is possible to sing, serve, give, teach, and speak spiritual words while refusing to obey in a particular area of life. God is not fooled by religious appearances. He desires obedience from the heart.

This does not mean that obedience earns our salvation. We are saved by grace through faith in Christ, not by our works. But grace does not make obedience unnecessary. Grace makes obedience possible and joyful. The forgiven sinner does not obey in order to purchase God’s favor. He obeys because he has received mercy.

Micah 6:8 gives a beautiful summary of faithful obedience: “What does the LORD require of you but to do justice, and to love kindness, and to walk humbly with your God?” Micah reminds us that obedience is not merely technical compliance. To do justice is to live according to what is right before God. To love kindness is to show mercy because God has shown mercy. To walk humbly with God is to live in reverent dependence upon him.

The Duty God Requires Leads Us to Christ

As soon as we hear that God requires obedience, we should feel the weight of that requirement. God does not require partial obedience or occasional obedience. He requires perfect, personal, and continual obedience. Our need is exposed because we have not obeyed God’s revealed will as we should. We have sinned in thought, word, and deed. We have failed to love God with all our heart, soul, mind, and strength. We have failed to love our neighbors as ourselves.

That is why this catechism question must lead us to Christ. Jesus perfectly obeyed the revealed will of God. He did what Adam failed to do, what Israel failed to do, and what we have failed to do. He always did what pleased the Father. Then, at the cross, he died for the disobedient. He bore the curse due to sinners and rose again so that those who trust in him would be forgiven, justified, and renewed by the Spirit.

Christian obedience is never separated from Christ. We do not obey apart from him. We obey because we belong to him. We obey by his grace, under his lordship, and in the power of his Spirit.

The Duty God Requires Today

The duty God requires of mankind is obedience to his revealed will. That is clear, searching, and good. God has not left us without instruction. He has spoken in His Word. He has given us Christ. He has sent his Spirit. He does not call us to a life of self-rule, but to glad submission under his wise and holy authority.

So the question before us is not whether God has made his will known. He has. The question is whether we will hear him. Will we present ourselves to God as living sacrifices? Will we refuse to be conformed to this world? Will we believe that obedience is better than sacrifice? Will we do justice, love kindness, and walk humbly with our God?

The duty God requires is obedience to his revealed will. And by the mercy of God in Christ, that obedience becomes not a burden to escape, but a life of worship to embrace.

Soli Deo Gloria