Cicero · Politics
Cicero’s doctrine of natural law - that there is one eternal, universal law, grounded in reason and nature, above all human enactments, binding all people and all nations alike.
Cicero advances one of the most influential ideas in the history of law and morality: that above all the particular laws enacted by particular governments, there exists a single, true, higher law - a law grounded not in human will or convention but in reason and nature itself. The laws of Rome, of Athens, of any state, are human creations, and they vary from place to place and change over time; some are just and some unjust. But there is, Cicero insists, a true law that does not vary and cannot be changed - a law written not by legislators but into the very nature of things, accessible to human reason, the same for all people in all times. This natural law is the eternal standard against which all human laws are to be measured, the source of their authority when they are just, and the proof of their illegitimacy when they are not. Beneath the shifting laws of nations lies one unchanging law of nature.
The natural law, for Cicero, has properties that sharply distinguish it from all human legislation. It is universal: the same for all people, in all nations, at all times - there is not one true law at Rome and another at Athens, one now and another in the future, but a single law binding on all rational beings everywhere. It is unchanging and eternal: it cannot be repealed, amended, or suspended, because it is not the product of human will but of the permanent nature of reason and things. It is inescapable: no one is exempt from it, and it cannot be abolished by any senate or people. And it is authoritative in the deepest sense: its author, promulgator, and judge is, Cicero says, God - the divine reason that orders the cosmos. To violate this law is not merely to break a rule but to deny one’s own rational nature and to flee from oneself; and though one may escape human punishment, one cannot escape the deepest penalty, which is the violation of one’s own nature and the judgment of the moral order itself.
The practical power of natural law lies in its function as a critical standard - a measure above human law by which human law can be judged. Without a higher law, the only standard for a law is whether it was properly enacted; ‘legal’ and ‘just’ collapse into one, and there is no ground for calling any duly-passed law unjust. Natural law breaks this collapse. It gives us a standard of justice that is independent of, and superior to, whatever any government happens to decree, so that we can say: this law, though legally valid, is unjust, because it violates the natural law; and this practice, though permitted or even commanded by the state, is wrong, because it offends against right reason and nature. This is the basis of every appeal beyond positive law to a higher justice - every claim that slavery was wrong even where it was legal, that tyranny is unjust even when it holds power, that there are rights no government may rightly violate. Natural law is the philosophical foundation of the conviction that might does not make right, that legality is not the same as justice, and that there is a standard above the state to which the state itself is answerable.
This is the opening of the lesson. The rest — the dialogue, the primary source, and the recall — is in the app.
You learned Cicero’s doctrine of a true, eternal law grounded in reason and nature, above all human laws. Twelve centuries later, Aquinas wove this into the great Christian synthesis of natural law. State how Aquinas developed it.
Leads to Thomas Aquinas.
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