Does Aquinas's natural law give a sound, reason-based moral theory, or do its fixed precepts and reliance on a human telos make it too rigid for modern ethical issues?
Component 3 Aquinas's natural law: the four tiers of law, the primary and secondary precepts, real and apparent goods, the doctrine of double effect, and its application to issues of life and death, with strengths and weaknesses.
An Eduqas Component 3 (Religion and Ethics) guide to Aquinas's natural law. Covers the four tiers of law (eternal, divine, natural, human), the primary and secondary precepts, real and apparent goods, the four cardinal and three theological virtues, the doctrine of double effect, and its application to abortion and euthanasia, with the strengths and weaknesses the exam asks you to evaluate.
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What this dot point is asking
Eduqas Component 3 (Theme 2, Deontological Ethics) studies Aquinas's natural law, a deontological, absolutist theory grounded in reason and human nature. You learn the four tiers of law, the primary and secondary precepts, the distinction between real and apparent goods, the virtues, the doctrine of double effect, and the application of natural law to issues of life and death (abortion, euthanasia). The exam rewards explaining the theory precisely (AO1) and evaluating whether it is too rigid for modern moral problems (AO2).
The answer
The four tiers of law
Primary and secondary precepts
Real and apparent goods, virtues, and double effect
Application to life and death; strengths and weaknesses
Applied to life and death, natural law's "preserve life" precept makes abortion and euthanasia wrong (intentionally taking innocent life), though double effect can permit, for example, removing a cancerous womb that foreseeably ends a pregnancy, or pain relief that foreseeably shortens life. Strengths: clear, universal, reason-based guidance (not mere authority); double effect and casuistry add flexibility. Weaknesses: the assumption of a single human telos is challenged by evolution and pluralism; the absolute secondary precepts are rigid in hard cases; and (per G. E. Moore) deriving moral oughts from natural facts may commit the naturalistic fallacy.
Examples in context
Try this
Q1. Explain the doctrine of double effect in natural law. [part (a), AO1, 20 marks]
- What the marker wants. Accurate account of the three conditions (the act not wrong in itself, the bad effect not the means, the good outweighing the bad) with an example, organised and using specialist terms. AO1 band.
Q2. "Natural law gives clear and reliable answers to questions of life and death." Evaluate this view. [part (b), AO2, 30 marks]
- Cue. Weigh the clarity and universality of the "preserve life" precept and double effect against the rigidity in hard cases and the challenge to a single human telos, and judge. AO2 band, the larger 30-mark tariff.
Exam-style practice questions
Practice questions written in the style of WJEC Eduqas exam questions on this dot point, with worked answer explainers. The year tag is the paper they imitate, not the source.
Eduqas A120 2019 (style)20 marksExplain Aquinas's natural law theory, including the precepts and the doctrine of double effect. [part (a), AO1, 20 marks]Show worked answer →
A part (a) AO1 question on the five-band scheme. Explain the theory accurately.
Aquinas's natural law is a deontological, absolutist theory grounded in reason and human nature. Four tiers of law: eternal law (God's rational ordering of the universe), divine law (revealed in scripture), natural law (the eternal law as known by human reason), and human law (the laws of states). The supreme principle is "do good and avoid evil". The five primary precepts express the goods natural to humans: preserve life, reproduce, educate the young, live in an ordered society, worship God. Secondary precepts are derived applications (e.g. do not murder, do not commit adultery). Real goods accord with our true purpose; apparent goods only seem good. The doctrine of double effect permits an act with a good intended effect and a foreseen but unintended bad effect, if the act is not wrong in itself, the bad is not the means, and the good outweighs the bad. A top band answer explains the tiers, precepts and double effect.
Eduqas A120 2021 (style)20 marks"Natural law is too rigid to deal with the complexity of moral decisions." Evaluate this view. [part (b), AO2, the full Eduqas tariff is 30 marks; the worked answer below is scaled to a 20-mark exemplar.]Show worked answer →
A part (b) AO2 question; the top band rewards balanced argument and a justified conclusion.
For the view: fixed primary precepts and absolute secondary precepts (no abortion, no euthanasia) cannot flex to hard cases; the assumption of a single human telos is questioned by evolution and pluralism; it commits the naturalistic fallacy (deriving ought from is). Against: double effect and the real/apparent good distinction give flexibility; casuistry applies the precepts sensitively to cases; it provides clear, universal, reason-based guidance, not just authority. Weigh whether the theory's flexibility (double effect, casuistry) answers the rigidity charge, and conclude. Links to proportionalism as a development that adds flexibility.
Related dot points
- Component 3 Hoose's proportionalism: the distinction between moral and pre-moral (ontic) goods and evils, the idea of a proportionate reason, its relation to natural law, and its application to life and death, with strengths and weaknesses.
An Eduqas Component 3 (Religion and Ethics) guide to Bernard Hoose's proportionalism. Covers the distinction between moral and pre-moral (ontic) goods and evils, the principle that there must be a proportionate reason to permit a pre-moral evil, its relation to natural law, and the charge that it collapses into consequentialism, with the evaluation the exam rewards.
- Component 3 divine command theory: the claim that morality depends on God's commands, the Euthyphro dilemma, and the strengths and weaknesses of grounding ethics in the will of God.
An Eduqas Component 3 (Religion and Ethics) guide to divine command theory. Covers the claim that morality is grounded in God's commands, the Euthyphro dilemma (is an act good because God commands it, or commanded because it is good), modified divine command theory, and the strengths and weaknesses the exam asks you to evaluate.
- Component 3 virtue theory: Aristotle's account of eudaimonia, the doctrine of the mean, moral and intellectual virtues, and the role of practical wisdom, with strengths and weaknesses.
An Eduqas Component 3 (Religion and Ethics) guide to Aristotle's virtue theory. Covers eudaimonia as the final end, the function argument, the doctrine of the mean, moral and intellectual virtues, practical wisdom (phronesis) and habituation, and the strengths and weaknesses the exam asks you to evaluate.
- Component 3 Fletcher's situation ethics: agape as the one absolute, the four working principles and six fundamental principles, conscience as a verb, and its application to life and death, with strengths and weaknesses.
An Eduqas Component 3 (Religion and Ethics) guide to Fletcher's situation ethics. Covers agape as the sole absolute, the four working principles, the six fundamental principles, conscience as a verb, the legalism/antinomianism contrast, and its application to issues of life and death, with the strengths and weaknesses the exam asks you to evaluate.
- Component 3 the application of ethical theories to issues of human life and death: abortion and euthanasia under natural law, proportionalism, situation ethics and utilitarianism, and whether ethical theories can be applied, with strengths and weaknesses.
An Eduqas Component 3 (Religion and Ethics) guide to the application of ethical theories to issues of human life and death. Covers how natural law, proportionalism, situation ethics and utilitarianism each handle abortion and voluntary euthanasia (sanctity versus quality of life), and whether ethical theories can be reliably applied, with the evaluation the exam rewards.
Sources & how we know this
- Eduqas A Level Religious Studies specification (A120QS) — WJEC Eduqas (2016)
- Thomas Aquinas, Summa Theologica — Project Gutenberg (1274)