Understanding the Modern Roots of the Moral Argument

Although many traditional arguments for God’s existence originate in ancient or medieval thought, the moral argument finds a prominent voice in modern philosophy. Immanuel Kant, an 18th-century thinker, famously rejected the older proofs for God’s existence yet held that God should be postulated on moral grounds. In his “Critique of Practical Reason,” Kant observed that human beings naturally seek happiness, though they also possess an innate sense of duty. He believed that the greatest good lies in uniting happiness and duty, but finite creatures lack the power to accomplish this unity perfectly. Since “ought implies can,” Kant concluded that it is morally necessary to presuppose both a supreme Deity and human immortality so that our moral longings might be fulfilled. Kant did not present this as a formal proof. Instead, he called it a moral postulate, a conviction arising from practical reason rather than demonstrable logic.

Some critics challenged Kant’s idea that all should strive for the greatest good. Others questioned whether moral imperatives necessarily imply the possibility of fulfilling them. Still, Kant’s insights highlighted an important dimension of Christian apologetics: the link between morality and a transcendent standard that grounds moral obligations.

The Quest for an Objective Moral Law

Subsequent thinkers, such as Hastings Rashdall and W. R. Sorley, presented arguments moving beyond Kant’s notion of a moral postulate. Rashdall contended that if an “absolutely perfect moral ideal” exists, it can only come from an absolute moral Mind. His reasoning emphasized that ideas reside in minds, and absolute ideas must derive from a perfect Mind rather than fragmented human consciousness. Sorley advanced this approach by defending the objectivity of moral law, insisting that people everywhere perceive a moral standard that transcends individual or collective human opinion. He noted that if a moral ideal is genuinely prior to and independent of finite minds, it must originate with a supreme Mind.

Their views reflect a fundamental conviction shared by Christians: morality is not merely a social convention or a matter of personal preference. Romans 2:14, 15 shows that even people who do not possess the revealed Law demonstrate “the work of the law written in their hearts.” Those deeply aware of conscience can recognize that moral reality points beyond oneself to a higher source.

The Reasonableness of a Moral Law Giver

Philosopher Elton Trueblood contributed further by stressing the rational necessity of a moral Law Giver. He argued that moral disagreement across cultures would be pointless if moral claims were entirely subjective. Conflict regarding right or wrong presumes a standard. A sense of moral duty likewise implies loyalty to a personal source of moral commands, not merely loyalty to an impersonal set of rules. One reason the Scriptures affirm a righteous Lawgiver is the biblical view that moral laws are divine prescriptions, not human inventions. Psalm 19:7 calls Jehovah’s regulations “perfect,” reflecting the conviction that they spring from a personal Creator, not from the fleeting opinions of societies.

In highlighting this moral standard, believers affirm that Jehovah’s commandments transcend local customs. People of all backgrounds often show striking agreement on the seriousness of murder, theft, or bearing false witness, although interpretations vary. This widespread recognition of moral obligations suggests an anchor that remains stable across time and geography. Proverbs 3:5, 6 underscores the importance of trusting in Jehovah’s wisdom rather than leaning on human understanding. Such a principle resonates with the idea that moral truth is grounded in a source beyond fallible human invention.

Addressing Objections to Objective Morality

Philosophers who reject a universal moral standard often claim that concepts of right and wrong differ so radically that universal morality is a myth. Some even view moral ideals as mere projections of human desires. Critics may claim that finite minds can imagine perfection without any corresponding ultimate reality, similar to thinking about mythical creatures or abstract shapes that do not physically exist. Yet this objection overlooks humanity’s persistent moral consciousness. People not only conceive of good behavior but also feel obliged to follow it, even at personal cost.

Such conviction is well illustrated by biblical texts. Romans 7:21-23 describes an internal conflict in which a person recognizes moral standards yet struggles to keep them. This conflict reveals that moral reality functions like a compass nudging individuals toward what they perceive as right, even when they fail to adhere to it. Explaining why so many societies and individuals share similar moral signposts remains difficult if morality is purely subjective.

C. S. Lewis and the Argument from Conscience

The 20th-century writer C. S. Lewis offered a widely read version of the moral argument in “Mere Christianity.” He pointed out that people across cultures make moral judgments, accuse others of wrongdoing, and feel guilt for personal failings. None of this makes sense unless everyone is appealing to a standard beyond personal preference. Romans 1:18-20 likewise teaches that certain truths about God are recognized by all, and a sense of moral obligation stands among these instinctive perceptions.

Lewis preempted objections by explaining that moral law is distinct from societal conventions or instincts. If the moral standard were merely an evolved instinct, the strongest drive would always prevail. Yet there are times when a person overcomes a strong self-preservation instinct for the sake of someone else’s welfare. This indicates the guidance of a moral rule that evaluates and sometimes restrains instinct. If morality came solely from community tradition, criticizing any society for oppression or injustice would be meaningless, as one culture’s standard would have no higher reference. Instead, the fact that people denounce evil or corruption in any culture implies an overarching law that stands above social agreements.

The Challenge of Evil and Injustice

Some argue that the presence of evil, cruelty, and injustice in the world refutes the existence of a good moral Law Giver. However, pointing out evil presupposes a knowledge of what is good. In other words, declaring the world to be unjust implicitly assumes there is a standard of justice. Habakkuk 1:2-4 portrays a prophet disturbed by the violence and wrongdoing he sees, yet his complaints rest on the certainty that Jehovah is righteous and has established moral order. If there were no objective standard, the prophet’s distress would make little sense.

C. S. Lewis noted that his own path from atheism to faith involved realizing that he possessed no consistent basis to label anything as unjust if the universe lacked a moral framework. Arguing that the world is unjust means relying on a moral benchmark. Yet a true universal benchmark must emanate from a Being who is absolute in righteousness. Psalm 33:5 says Jehovah “loves righteousness and justice,” demonstrating that moral perfection flows from his very nature.

Moral Duty and Practical Living

The moral argument is not intended as a substitute for genuine faith in Jehovah or for a personal study of his Word. Scripture calls on believers to “sanctify the Christ as Lord in your hearts, always being ready to make a defense” (1 Peter 3:15). Explaining the moral argument can be one aspect of that defense. Yet the heart of the Christian life involves walking in obedience to God’s instructions, as expressed in Micah 6:8: “What does Jehovah require of you but to do justice, to love kindness, and to walk modestly with your God?” The recognition of moral law should inspire actual practice of that law.

True maturity involves recognizing that moral conduct stems from divine revelation. When the conscience prompts individuals to do good, it echoes the character of the Creator who sets the standard. Though critics dismiss the objectivity of morals, those who follow biblical teaching see that moral obligations reach their highest meaning when connected to a righteous and caring God. By holding fast to the historical reality of a moral Law Giver, believers find both confidence in their moral convictions and solace in knowing that goodness is more than a human invention. Rather, it reflects the perfection of Jehovah, who has inscribed within us the awareness that genuine righteousness exists.

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About the Author

EDWARD D. ANDREWS (AS in Criminal Justice, BS in Religion, MA in Biblical Studies, and MDiv in Theology) is CEO and President of Christian Publishing House. He has authored over 220+ books. In addition, Andrews is the Chief Translator of the Updated American Standard Version (UASV).