Natural Law School — Jurisprudence Notes

Natural Law School

At Nuremberg in 1945, Nazi officials defended themselves by saying they had merely obeyed the law of their state. The tribunal answered that some things are so unjust that “law” commanding them is not law a person is bound to obey — there is a higher standard against which even valid enactments can be judged. That ancient idea, that above man-made law stands a law of reason and morality, is the Natural Law tradition, and it is the oldest question in jurisprudence.

What is Natural Law?

Start with the everyday intuition. When a child says “that’s not fair!”, she is not quoting a statute — she is appealing to a standard of right and wrong she believes exists whether or not any rule-book records it. Natural Law is that intuition made into a theory: there exists a higher, universal law — grounded in reason, nature and morality — which is superior to the law made by human beings, and man-made law derives its validity and its obligation to be obeyed from its conformity with that higher law.

The school’s central maxim says it all: lex injusta non est lex [an unjust law is no law]. If a human enactment conflicts with the natural, moral law, the naturalist says it lacks true legal quality — it may be enforced by force, but it does not bind in conscience.

The evolution of Natural Law — you should be able to sketch the line from the ancients to the modern revival:

Ancient Greece — the seed. The Stoics held that the universe is governed by reason (logos), and that human law is just when it accords with this rational order. Aristotle distinguished natural justice (the same everywhere, from nature) from legal justice (varying from place to place, from convention).
Rome — into legal doctrine. Roman jurists developed the jus naturale (natural law, common to all living things, dictated by nature) alongside the jus gentium (law common to all peoples). Cicero wrote that true law is “right reason in agreement with nature… it is unchangeable and eternal.”
The Middle Ages — Aquinas. St. Thomas Aquinas gave the classic Christian statement. He arranged law in four tiers: eternal law (God’s reason governing the universe), divine law (revealed in scripture), natural law (the part of eternal law knowable by human reason), and human (positive) law. A human law that conflicts with natural law is, he said, “a perversion of law” — not binding in conscience.
The Age of Reason — social contract. Natural law was secularised. Hobbes, Locke and Rousseau grounded it not in God but in human nature and reason, and built theories of natural rights and the social contract. Locke’s natural rights to life, liberty and property fed straight into the American Declaration of Independence and modern human-rights thinking.
The 19th-century eclipse. The rise of Analytical positivism (Austin) and the Historical school pushed natural law aside as vague and unscientific.
The 20th-century revival. The horrors of two World Wars revived it. Lon Fuller argued that law has an “inner morality” — eight principles of legality (rules must be general, published, prospective, clear, non-contradictory, possible to obey, stable, and applied as announced); a system that flouts them is not a legal system at all. John Finnis rebuilt natural law on seven “basic goods” (life, knowledge, play, friendship, and so on) that practical reason directs us to pursue.

St. Thomas Aquinas: “Lex iniusta non est lex” — an unjust law is not a law, but a perversion of law; a law that conflicts with the natural law does not bind in conscience.

In Simple Terms: Above the law that Parliaments make sits a higher law of reason and morality. A statute is truly “law” only so far as it is just; a grossly unjust command has the form of law but not its binding force.

🧩 WORKED EXAMPLE — Applying “an unjust law is no law”

Facts. A regime passes a validly-enacted statute ordering officials to persecute a minority. An official later pleads he only “followed the law”.

Rule. Natural Law: lex injusta non est lex — an enactment that grossly violates the moral law lacks true legal validity and cannot bind the conscience.

Apply. A positivist (Austin) would say the statute is law because a sovereign commanded it; its morality is a separate question. A naturalist answers that a command this unjust is not law at all, so obedience to it is no defence.

Conclusion. The naturalist position underlies the Nuremberg judgments and modern human rights — proof that this ancient theory does real work. In the exam, always pair the statement with this criticism-and-answer.

Merits. It is the source of human rights and constitutional morality; it gives the citizen a principled ground to resist tyranny; it keeps law tied to justice and supplies the moral direction that pure positivism lacks; the Indian Supreme Court’s expansion of the right to life and liberty draws on exactly this spirit.

Criticisms (score these):

Vague and uncertain — “reason” and “nature” mean different things to different people and different ages; what one calls natural, another calls unnatural.
Confuses “is” and “ought” — it mixes what the law is with what it ought to be, which the positivists say are separate questions.
No agreed content — natural law has been used to justify both slavery and its abolition, both absolute monarchy and revolution.
Not “law” in a lawyer’s sense — it has no determinate author and no sanction, so the analytical school denies it is law at all.

flowchart TD
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    N --> G["Greece / Rome<br/>Aristotle, Cicero — right reason"]:::leaf
    N --> A["Aquinas<br/>eternal / divine / natural / human law"]:::leaf
    N --> C["Social Contract<br/>Hobbes, Locke, Rousseau — natural rights"]:::leaf
    N --> R["Modern revival<br/>Fuller (inner morality), Finnis (basic goods)"]:::leaf
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Case Laws

Kesavananda Bharati v State of Kerala (1973) — the basic-structure doctrine reflects natural-law thinking: some values are so fundamental that even a valid amendment cannot destroy them.
Maneka Gandhi v Union of India (1978) — “procedure established by law” must be just, fair and reasonable — reading a higher moral standard into the words of the statute.
A.D.M. Jabalpur v Shivakant Shukla (1976) — the celebrated dissent (that some rights survive even a suspension of enforcement) is a natural-law argument; the majority’s contrary view is now regarded as wrong.

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