Arguments for God's Existence Lesson 57 of 157

From Moral Law to Moral Lawgiver

Completing the Moral Argument for God

We have established that objective moral values and duties exist and that God provides the best foundation for them. Now we draw together the threads of the moral argument, tracing the path from moral law to moral Lawgiver. This argument has a unique power in apologetics: it begins not with abstract metaphysics but with the moral experience everyone shares. Every person who has felt the pull of conscience, the outrage at injustice, or the recognition of genuine goodness has encountered evidence for God—whether they recognize it as such or not.

The Moral Argument Completed

Let us state the moral argument in its complete form and trace the reasoning that supports each step:

The Moral Argument

Premise 1: If God does not exist, objective moral values and duties do not exist.

Premise 2: Objective moral values and duties do exist.

Conclusion: Therefore, God exists.

The argument is logically valid—the conclusion follows necessarily from the premises. If both premises are true, the conclusion cannot be false. Our task is to show that both premises are, in fact, true.

Premise 2: Objective Morality Exists

We begin with Premise 2, which is closer to common experience. Most people, in practice if not always in theory, believe in objective morality. They believe the Holocaust was really evil, not merely unfashionable. They believe torturing children for fun is genuinely wrong, not just contrary to current preferences. They believe human rights are real, not just useful fictions.

The evidence for objective morality includes:

Moral experience: Our moral perceptions present themselves as perceptions of objective reality, not mere expressions of preference. When we witness injustice, we perceive that something genuinely wrong is happening.

Moral disagreement: The very practice of moral argument presupposes that there are moral truths to argue about. We don't debate matters of mere taste with such seriousness.

Moral reform: We believe in moral progress—that ending slavery was an improvement, not merely a change. This presupposes an objective standard we're progressing toward.

Cross-cultural convergence: Despite surface differences, fundamental moral principles appear across cultures—prohibitions on murder, theft, and lying; requirements of justice, courage, and care for the vulnerable.

Denials of objective morality face the difficulty of explaining these phenomena. If morality is merely subjective, why does it present itself as objective? Why do we argue about it? Why do we believe in moral progress? The most straightforward explanation is that objective morality is real.

"Indeed, when Gentiles, who do not have the law, do by nature things required by the law, they are a law for themselves, even though they do not have the law. They show that the requirements of the law are written on their hearts, their consciences also bearing witness."

— Romans 2:14-15

Premise 1: Without God, No Objective Morality

The more contested premise is the first: that without God, objective moral values and duties would not exist. This premise requires careful examination of what could ground morality if God does not exist.

Naturalism's challenge: If naturalism is true—if physical reality is all there is—then humans are complex physical systems produced by blind evolutionary processes. In such a universe, where do moral facts come from? Physical facts alone don't generate moral "oughts." The laws of physics don't prescribe how we should treat each other.

Evolution explains belief, not truth: Evolution might explain why we have moral beliefs (they enhanced survival), but it cannot establish that those beliefs are true. At most, evolution shows that believing in morality was useful, not that morality exists. Useful fictions are still fictions.

Social contracts are conventional: Social agreements can explain why we agree on moral rules but not why those rules are objectively binding. If morality is just an agreement, different societies could validly agree on different—even horrific—rules.

Moral Platonism is mysterious: Positing abstract moral facts that exist independently provides no explanation of why those facts hold or how we access them. And abstract objects cannot generate obligations; they cannot command or require anything.

The challenge is to find something that can ground genuine moral authority—the binding "ought" that characterizes moral obligation. What could make it the case that we really ought to do certain things, not just that it would be useful or agreeable?

God as the Foundation

Theism provides what naturalism cannot: an adequate foundation for both moral values and moral duties.

God's Nature Grounds Values

On the theistic view, moral values are grounded in God's nature. God is essentially good—loving, just, merciful, faithful, holy. These attributes are not arbitrary; they reflect who God eternally and necessarily is. God's nature serves as the standard against which all else is measured. Actions, character traits, and states of affairs are good to the extent they reflect God's nature; they are evil to the extent they oppose it.

This provides an objective standard. Goodness is not relative to human opinions but grounded in the unchanging character of God. It also explains why moral values are personal in nature—why morality concerns how we treat persons. The ultimate good is a person, and persons made in God's image have inherent moral significance.

God's Commands Ground Duties

Moral duties—the obligations that bind us—are grounded in God's commands. We are obligated because God, who has rightful authority over us as Creator and sustainer, has commanded certain things and forbidden others. His commands express His good nature and establish what we ought to do.

This provides genuine moral authority. Unlike abstract principles (which cannot command) or social agreements (which cannot obligate absolutely), God has the standing to impose binding obligations. His authority is grounded in His nature as Creator, His character as perfectly good, and His relationship to us as the one on whom we depend for existence itself.

The Connection Between Nature and Commands

God's commands are not arbitrary; they flow from His nature. God commands love because God is love. God forbids injustice because God is just. The moral law reflects the Lawgiver's character. This answers the Euthyphro dilemma: morality is neither arbitrary (it's grounded in God's necessary nature) nor independent of God (God's nature is the ultimate standard).

The Moral Lawgiver

The moral argument thus leads us from the existence of moral law to the existence of a moral Lawgiver. The features of morality we experience—its objectivity, its authority, its personal character—find their explanation in God.

A Personal Lawgiver

Moral obligations are inherently personal. They concern how we treat persons; they bind persons to behave in certain ways; they presuppose a relationship between the obligated and the authority who obligates. Impersonal forces cannot generate personal obligations. The moral law thus points to a personal Lawgiver.

A Transcendent Lawgiver

The moral law is universal—binding on all people, in all places, at all times. It transcends particular cultures, eras, and individuals. Such a universal law requires a transcendent source—a Lawgiver who is not merely another being within the world but the ground of the world, whose authority extends to all creatures.

A Good Lawgiver

The moral law commands goodness and forbids evil. This reflects the character of the Lawgiver. A being whose nature is evil could not be the source of a genuinely good moral law. The existence of objective goodness points to a Lawgiver who is Himself perfectly good.

A Holy Lawgiver

The moral law not only guides but judges. It condemns us when we fail; it measures our shortcomings; it holds us accountable. This suggests a Lawgiver who cares about moral purity, who cannot compromise with evil, who demands holiness. The Christian concept of God's holiness—His absolute moral perfection and separation from sin—fits what the moral law reveals.

"Holy, holy, holy is the LORD Almighty; the whole earth is full of his glory."

— Isaiah 6:3

Moral Experience as Divine Encounter

If the moral argument is sound, then moral experience is a kind of encounter with God—mediated through conscience, moral perception, and the sense of obligation. Every person who feels the pull of duty, the weight of guilt, or the attraction of goodness is experiencing something that points to God.

Conscience as God's Voice

Conscience—the inner sense of right and wrong that approves or condemns our actions—may be understood as God's voice within us. Not that conscience is infallible (it can be malformed or ignored), but that it reflects the moral law God has inscribed on human hearts. When conscience speaks, something of God's moral character is being communicated.

This understanding transforms how we view guilt. Guilt is not merely a psychological malfunction to be therapized away but a genuine recognition that we have violated moral reality—that we have sinned against a holy God. The appropriate response to guilt is not suppression but repentance.

Moral Longing as Longing for God

The human desire to be good, to live rightly, to become the people we ought to be—this moral longing may be understood as a longing for God Himself, the source of all goodness. We are drawn to goodness because we are made by and for the Good. Our moral aspirations point beyond themselves to the One who is perfect goodness.

Moral Failure as Separation from God

The universal experience of moral failure—falling short of what we know we should be—is also revealing. We not only know the good; we fail to do it. This gap between moral knowledge and moral practice points to something wrong with us—what Christianity calls sin. The moral law not only guides; it convicts. And in convicting us, it prepares us for the gospel.

C.S. Lewis on Moral Law

C.S. Lewis saw the moral argument as particularly powerful because it begins with something everyone experiences. In Mere Christianity, he argues that the universal sense of moral law—the belief that there are things we ought and ought not to do—is best explained by a moral Lawgiver. "These, then, are the two points I wanted to make. First, that human beings, all over the earth, have this curious idea that they ought to behave in a certain way, and cannot really get rid of it. Secondly, that they do not in fact behave in that way. They know the Law of Nature; they break it."

From Morality to Gospel

The moral argument does not merely establish God's existence; it prepares the way for the gospel. For the moral law that points to God also condemns us before God.

The Law Condemns

If God exists and has established moral law, then we are accountable to Him. And we have all failed. "All have sinned and fall short of the glory of God" (Romans 3:23). The moral law that proves God's existence also proves our guilt. We cannot stand before a holy Lawgiver on the basis of our moral performance; we have violated His law repeatedly.

This is not good news in itself, but it is necessary preparation for good news. The person who thinks they're morally fine has no need for a Savior. The moral argument, by establishing objective moral standards and our failure to meet them, creates the felt need that the gospel addresses.

The Gospel Answers

The God who grounds morality is also the God who provides salvation. The Lawgiver becomes the Savior. Christ, who perfectly embodied the moral law, died for those who broke it. The just God justifies the ungodly through faith in Christ (Romans 3:26; 4:5).

The moral argument thus flows naturally into the gospel. It establishes that God exists and that we're accountable to Him. It reveals our need for forgiveness. And it opens the door to the announcement that forgiveness is available—that the moral Lawgiver offers grace to lawbreakers through Jesus Christ.

"Therefore no one will be declared righteous in God's sight by the works of the law; rather, through the law we become conscious of our sin. But now apart from the law the righteousness of God has been made known... This righteousness is given through faith in Jesus Christ to all who believe."

— Romans 3:20-22

Using the Moral Argument

The moral argument is particularly useful in apologetic conversation because it connects with universal human experience.

Start with Shared Moral Convictions

Most people believe in moral objectivity in practice. They believe the Holocaust was really evil, that child abuse is genuinely wrong, that justice matters. Start here: "Do you believe some things are really wrong—not just unpopular, but objectively wrong?" Most will say yes. Then ask: "What do you think makes them wrong? Where do objective moral facts come from?"

Explore the Alternatives

Walk through the naturalistic alternatives together. Can evolution ground objective morality? Social contracts? Human flourishing? Show—gently and conversationally—that these explanations fall short. They might explain moral beliefs or moral agreements but not objective moral facts that bind everyone.

Introduce the Theistic Answer

Present God as the answer to the grounding problem. A perfectly good God, whose nature defines goodness and whose commands establish obligation, provides exactly what morality needs: an objective standard and a legitimate authority. The moral law makes sense if there's a moral Lawgiver.

Connect to the Gospel

Don't stop with God's existence. The moral law that proves God also condemns us. We've all violated it. But the same God who gives the law offers grace to those who've broken it. This is the gospel: not that good people get rewarded, but that guilty people get forgiven through Christ.

A Conversation Outline

"Do you think some things are really wrong—not just unpopular? [Yes.] What makes them wrong? [Discussion.] Here's what I find interesting: if there's no God, it's really hard to explain why anything is objectively wrong. Evolution explains why we think things are wrong, not why they are. Social agreements can be changed. But if there's a God who is perfectly good, whose nature defines goodness—that would explain where moral facts come from. The moral law points to a Lawgiver. And here's the uncomfortable part: if there's a moral law, we've all broken it. We need more than moral guidance; we need forgiveness. That's what Christianity offers."

Objections Revisited

We addressed objections to the moral argument in earlier lessons, but let's briefly revisit key responses:

"Atheists Can Be Moral"

Of course they can. The argument isn't that atheists can't know or practice morality but that atheism can't ground morality. Atheists can recognize moral truths (common grace gives moral knowledge to all); the question is what makes those truths true. Knowledge and ontology are different issues.

"The Euthyphro Dilemma"

Is something good because God wills it, or does God will it because it's good? Neither—goodness is grounded in God's nature, which is neither arbitrary nor external to God. God's commands express His nature; His nature is the ultimate standard. The dilemma presents a false choice.

"Religion Has Caused Harm"

This concerns behavior, not grounding. Religious people have done evil, but that doesn't undermine the argument that God grounds morality—it confirms that humans violate the moral law, even religious humans. The question is where moral facts come from, not whether religious people always follow them.

"He has shown you, O mortal, what is good. And what does the LORD require of you? To act justly and to love mercy and to walk humbly with your God."

— Micah 6:8

Conclusion: The Law That Leads to Christ

The moral argument traces a path from common human experience to the God who made us. Every person who recognizes genuine right and wrong, who feels the weight of obligation, who experiences guilt for falling short—every such person encounters evidence for God. The moral law written on human hearts testifies to the Lawgiver.

But the moral law does more than point to God; it drives us to Christ. For we have not kept the law. We have violated it in thought, word, and deed. We stand guilty before the holy Lawgiver. If the moral argument is sound, we need not just a philosophy but a Savior.

And a Savior has come. The God who established the moral law has provided for those who break it. Christ kept the law perfectly and died for those who didn't. In Him, the righteous requirements of the law are fulfilled (Romans 8:4). The moral law leads us to Christ—not as another command to be kept but as the One who kept it for us and offers us His righteousness as a gift.

"So the law was our guardian until Christ came that we might be justified by faith" (Galatians 3:24).

"God made him who had no sin to be sin for us, so that in him we might become the righteousness of God."

— 2 Corinthians 5:21

Discussion Questions

  1. The moral argument moves from moral law to moral Lawgiver. In your own words, explain this connection. Why does the existence of objective morality point to God rather than being a freestanding fact?
  2. The lesson suggests that moral experience is a kind of encounter with God. How might this perspective change how we view conscience, guilt, and moral aspiration? How could this insight be used in evangelistic conversation?
  3. How does the moral argument naturally lead to the gospel? Practice articulating the connection: from objective morality, to God as Lawgiver, to our failure to keep the law, to Christ who kept it for us.
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Discussion Questions

  1. The moral argument moves from moral law to moral Lawgiver. In your own words, explain this connection. Why does the existence of objective morality point to God rather than being a freestanding fact?
  2. The lesson suggests that moral experience is a kind of encounter with God. How might this perspective change how we view conscience, guilt, and moral aspiration? How could this insight be used in evangelistic conversation?
  3. How does the moral argument naturally lead to the gospel? Practice articulating the connection: from objective morality, to God as Lawgiver, to our failure to keep the law, to Christ who kept it for us.