Natural Moral Law: Aquinas' theory, the four tiers of law, the primary and secondary precepts, real and apparent goods, and the doctrine of double effect.

What this dot point is asking

This WJEC theme asks you to explain and evaluate Natural Moral Law as developed by Aquinas, the leading deontological (duty-based) and absolutist theory on the syllabus. You need the foundation in human purpose (telos), the four tiers of law, the primary and secondary precepts, the distinction of real and apparent goods, and the doctrine of double effect. AO1 wants accurate, detailed exposition; AO2 wants a reasoned judgement on whether the theory works.

The answer

The foundation: purpose and reason

Because it is grounded in reason and nature rather than scripture alone, Natural Law claims to be universal, binding on all people, religious or not.

The four tiers of law and the precepts

From human nature, reason derives the five primary precepts: the preservation of life, reproduction, the education of the young (or nurture), living in an ordered society, and the worship of God. (A common mnemonic is "POWER" or similar.) From these, reason works out secondary precepts, specific rules that apply the primary precepts to situations (for example, "do not murder" and "do not steal" follow from preserving life and ordered society). Primary precepts are unchanging; secondary precepts can be adjusted to circumstances.

Real and apparent goods, and double effect

The doctrine of double effect addresses cases where an action has both a good and a bad effect. Such an act may be permissible if: the act itself is good or neutral; the good effect is intended and the bad effect only foreseen, not intended; the bad effect is not the means to the good; and there is a proportionate reason. The classic example is giving a dying patient pain relief that may shorten life: the intention is to relieve pain, not to kill.

Examples in context

Model paragraph (is Natural Law as rigid as critics claim?). The charge that Natural Law is too rigid is the central evaluative issue, and it is only partly fair. The theory does treat the primary precepts and certain secondary precepts as absolute, which can yield hard results: an exceptionless rule against taking innocent life, for instance, gives no room for the kind of weighing that consequentialists demand. Yet Natural Law contains genuine flexibility that the caricature ignores. Secondary precepts are derived by reason and can vary with circumstance, since they apply the primary precepts to particular cases. The doctrine of double effect allows an act with a foreseen bad consequence when the intention is good and the conditions are met, so the theory can permit, for example, life-shortening pain relief that a crude absolutism would forbid. The deeper objection is not rigidity but the assumption of a fixed human nature and single telos: if there is no such shared purpose, the derivation of precepts collapses, and the move from how humans are to how they ought to act faces the naturalistic fallacy. A strong evaluation therefore concedes the flexibility of secondary precepts and double effect while pressing the contested premise about human nature.

Try this

Q1. Name the five primary precepts. [5 marks]

• Cue. Preservation of life, reproduction, education of the young, ordered society, and worship of God.

Q2. What is the doctrine of double effect? [2 marks]

• Cue. A good act with a foreseen bad side-effect may be permissible if the bad effect is not intended or the means, and there is a proportionate reason.

Q3. Evaluate the view that Natural Moral Law gives clear and reliable moral guidance. [20 marks]

• What the marker wants. A balanced argument weighing the rational, universal basis and clear precepts against rigidity, the fixed view of human nature, and the naturalistic fallacy, with a reasoned judgement.