The Moral Argument and Normative Force

Introduction

The existence of objective moral truths, propositions asserting the inherent wrongness of acts like gratuitous cruelty, poses a profound challenge in metaethics: what is their ontological foundation, and what imparts their obligatory force? This question probes not only the reality of moral duties but also the normative authority that compels adherence. This essay argues that classical theism, which posits a maximally great being (God) as the source of moral value, offers the most coherent and comprehensive explanation for both the objectivity and bindingness of moral truths, surpassing naturalism’s confinement to physical processes. Through a deductive argument, I contend that theism uniquely satisfies the demands of moral ontology and deontology, inviting rigorous philosophical examination.

The Argument

The argument is formalised as follows: 

P1. Objective moral truths exist. 

P2. Theism and naturalism both propose explanations for moral duties.

P3. Naturalism lacks the normative force to render moral duties obligatory. 

P4. Theism possesses the normative force to render moral duties obligatory.

Conclusion: Therefore, theism is the best explanation for objective moral truths and their normative authority.

Premise 1: The Existence of Objective Moral Truths:

Objective moral truths are propositions about right and wrong that hold independently of subjective opinion or cultural norms. The inherent wrongness of torturing an innocent person for amusement, for instance, endures as a truth irrespective of societal assent. This premise aligns with moral realism, which posits that moral facts constitute part of reality’s metaphysical structure [1]. J.L. Mackie, a moral sceptic, challenges this view, arguing that objective values are “queer” in a naturalistic framework, yet he acknowledges their intuitive pull [2]. C.S. Lewis similarly contends that universal moral intuitions, such as the condemnation of betrayal across cultures, suggest a “real moral law” transcending human construction [3]. While moral nihilism disputes this premise, the widespread assent to certain moral absolutes evident in global repudiation of genocide lends it prima facie plausibility. 

Premise 2: Explanatory Scope of Theism and Naturalism:

Both theism and naturalism offer accounts for the emergence of moral duties, albeit with divergent metaphysical commitments. 

• Theism holds that moral obligations derive from the nature or commands of God, a maximally great being characterised by perfect goodness, omniscience, and omnipotence. Robert Adams’s modified divine command theory posits that duties, such as the prohibition against lying, are grounded in God’s commands, which reflect His essentially good character [4]. God’s nature serves as the ontological anchor for moral value, ensuring duties are neither arbitrary nor external to His being. 

• Naturalism attributes moral duties to empirical processes. Evolutionary ethics suggests that behaviors like altruism emerged to enhance group survival, while moral naturalists like Philippa Foot argue that obligations arise from natural facts about human flourishing [5]. Sam Harris’s framework ties duties to maximising well-being, rooted in scientific insights into sentience [6].

Premise two concedes that both frameworks can descriptively account for moral duties, setting the stage for a critical assessment of their normative adequacy.

Premise 3: Naturalism’s Normative Insufficiency:

Naturalism’s explanatory power diminishes when tasked with grounding the normative force of moral obligations—the authority that renders duties binding. David Hume’s is-ought distinction illuminates this challenge: descriptive facts about the world, such as the social benefits of cooperation, do not logically entail prescriptive duties to cooperate [7]. While naturalism may elucidate why honesty fosters trust or why kindness correlates with well-being, it cannot justify why one is obligated to prioritise these over self-interest. 

Consider an agent who deceives to secure personal gain without detection. Naturalism might deem this act detrimental to societal cohesion, yet it lacks a transcendent standard to establish its intrinsic wrongness or obligatory avoidance. Rationalist accounts, such as Christine Korsgaard’s Kantian constructivism, propose that moral duties stem from rational consistency, where acting otherwise undermines one’s agency [8]. However, as Mackie observes, such accounts presuppose the value of rationality, which not all agents accept, thus undermining universal bindingness [9]. 

A counterfactual further exposes this deficiency: imagine a regime achieving global dominance and rationalising an atrocity, such as ethnic cleansing, as morally obligatory, reshaping social norms and rational discourse to align with its ideology. Naturalism’s reliance on human consensus or reason risks endorsing such a conclusion in that context, as no external standard exists to adjudicate otherwise. This susceptibility to relativism undermines the objectivity posited in premise one and the normativity required for obligation. Even Erik Wielenberg’s non-theistic moral realism, which posits independent moral facts, struggles to explain why such facts compel action, as they lack the authority to enforce compliance [10].

Premise 4: Theism’s Normative Sufficiency:

Theism overcomes these challenges by grounding moral obligations in the nature and commands of a maximally great being. God’s essential goodness—encompassing justice, love, and truth—constitutes the ontological foundation of moral value. William Lane Craig articulates that “God’s nature is the paradigm of moral goodness,” and His commands, as necessary expressions of that nature, establish moral duties [11]. The duty to refrain from theft, for instance, reflects God’s just character, ensuring its non-arbitrary status. 

The normative force of these duties derives from God’s unique attributes: 

• Omniscience ensures that God’s commands align with objective truths about the good, tailored to the flourishing of created beings. If God knows that charity is good, its truth is necessary, rendering it an objective fact [12]. 

• Omnipotence guarantees the enforceability of divine commands, whether through creation’s moral order, the promptings of conscience, or ultimate judgment. Disobedience thus carries metaphysical significance, transcending social or personal consequences. 

• Moral Perfection as a maximally great being ensures that God’s nature is the standard of value, resolving arbitrariness concerns by anchoring morality in an unchanging being.

This framework explains why moral duties bind universally: they emanate from the creator’s authority, whose will defines the moral order. Unlike naturalism’s contingent reasons, theism’s divine mandate imbues obligations with inescapable normative weight.

Objections and Rejoinders

To ensure the argument’s resilience, I will try to address three sophisticated objections challenging its premises. 

• Objection: Rationality as a Source of Normative Force

Naturalists like Korsgaard contend that moral obligations arise from rational agency, where inconsistent action undermines rational integrity [13]. This suggests that logic generates binding duties, challenging premise three. 

However, logic describes what is rational, not why one ought to be rational. Hume’s is-ought distinction clarifies that prescriptive force requires a value external to descriptive reasoning [14]. If an agent rejects rationality, as a sociopath might, no naturalistic principle compels compliance. Theism grounds obligation in God’s authoritative command, binding irrespective of disposition, ensuring universal normativity [15].

• Objection: The Euthyphro Dilemma

Critics invoke the Euthyphro Dilemma: are moral duties obligatory because God commands them (implying arbitrariness), or does God command them because they are good (implying independence)? This dichotomy is fallacious. Moral goodness is identical to God’s nature, neither arbitrary nor external. God’s commands are necessary expressions of His just and loving character, ensuring that duties like “do not harm” are intrinsically good [16]. God’s omniscience guarantees that His commands reflect objective truths, while His omnipotence enforces their bindingness. Naturalism’s reliance on human reason lacks such authority, as reason’s variability undermines universality [17].

• Objection: Non-Theistic Moral Realism

Philosophers like Wielenberg propose that objective moral facts exist independently, akin to Platonic forms, negating theism’s necessity [18]. However, abstract facts lack normative force. A proposition like “kindness is good” may be true, but why must one act kindly? As C.S. Lewis argues, impersonal standards cannot “command” allegiance [19]. Theism’s personal God, whose commands carry relational and judicial authority, bridges this gap. Naturalism’s appeal to consensus risks relativism, as a counterfactual where perverse norms dominate illustrates. Theism’s transcendent standard remains steadfast [20].

Conclusion:

The reality of objective moral truths and their normative authority demands a metaphysical foundation capable of sustaining both their objectivity and bindingness. Naturalism, while adept at describing moral behavior’s origins, fails to bridge the is-ought divide, leaving obligations vulnerable to contingency and relativism. Theism, by anchoring moral value in the nature of a maximally great being and deriving duties from His authoritative commands, offers a unified and robust explanation. This argument posits theism’s explanatory optimality, inviting sceptics to interrogate the foundations of our moral convictions. If morality transcends human construct, theism provides a compelling vision of a moral universe ordered by divine purpose.

References:

1. Shafer-Landau, R. (2003). Moral Realism: A Defence. Oxford University Press. 

2. Mackie, J. L. (1977). Ethics: Inventing Right and Wrong, p. 38. Penguin Books. 

3. Lewis, C. S. (1943). Mere Christianity, p. 21. Geoffrey Bles. 

4. Adams, R. M. (1999). Finite and Infinite Goods: A Framework for Ethics, p. 250. Oxford University Press. 

5. Foot, P. (2001). Natural Goodness, p. 45. Oxford University Press. 

6. Harris, S. (2010). The Moral Landscape: How Science Can Determine Human Values, p. 6. Free Press. 

7. Hume, D. (2000). A Treatise of Human Nature, p. 469. (D. F. Norton & M. J. Norton, Eds.). Oxford University Press. (Original work published 1739) 

8. Korsgaard, C. M. (1996). The Sources of Normativity, p. 103. Cambridge University Press. 

9. Mackie, J. L. (1977). Ethics: Inventing Right and Wrong, p. 40. Penguin Books. 

10. Wielenberg, E. J. (2014). Robust Ethics: The Metaphysics and Epistemology of Godless Normative Realism, p. 83. Oxford University Press. 

11. Craig, W. L. (2008). Reasonable Faith: Christian Truth and Apologetics, p. 182. Crossway. 

12. Adams, R. M. (1999). Finite and Infinite Goods: A Framework for Ethics, p. 262. Oxford University Press. 

13. Korsgaard, C. M. (1996). The Sources of Normativity, p. 123. Cambridge University Press. 

14. Hume, D. (2000). A Treatise of Human Nature, p. 470. (D. F. Norton & M. J. Norton, Eds.). Oxford University Press. (Original work published 1739) 

15. Craig, W. L. (2008). Reasonable Faith: Christian Truth and Apologetics, p. 184. Crossway. 

16. Adams, R. M. (1999). Finite and Infinite Goods: A Framework for Ethics, p. 250. Oxford University Press. 

17. Mackie, J. L. (1977). Ethics: Inventing Right and Wrong, p. 42. Penguin Books. 

18. Wielenberg, E. J. (2014). Robust Ethics: The Metaphysics and Epistemology of Godless Normative Realism, p. 20. Oxford University Press. 

19. Lewis, C. S. (1943). Mere Christianity, p. 48. Geoffrey Bles. 

20. Craig, W. L. (2008). Reasonable Faith: Christian Truth and Apologetics, p. 182. Crossway.