Human rights
Natural rights

Natural law theories base human rights on a "natural" moral, religious or even biological order which is independent of transitory human laws or traditions. Socrates and his philosophic heirs, Plato and Aristotle, posited the existence of natural justice or natural right (dikaion physikon, δικαιον φυσικον, Latin ius naturale). Of these, Aristotle is often said to be the father of natural law, although evidence for this is due largely to the interpretations of his work by Thomas Aquinas. The development of this tradition of natural justice into one of natural law is usually attributed to the Stoics.

Some of the early Church fathers sought to incorporate the until then pagan concept of natural law into Christianity. Natural law theories have featured greatly in the philosophies of Thomas Aquinas, Francisco Suárez, Richard Hooker, Thomas Hobbes, Hugo Grotius, Samuel von Pufendorf, and John Locke. In the 17th century, Thomas Hobbes founded a contractualist theory of legal positivism on what all men could agree upon: what they sought (happiness) was subject to contention, but a broad consensus could form around what they feared (violent death at the hands of another). The natural law was how a rational human being, seeking to survive and prosper, would act. It was discovered by considering humankind's natural rights, whereas previously it could be said that natural rights were discovered by considering the natural law. In Hobbes' opinion, the only way natural law could prevail was for men to submit to the commands of the sovereign. In this lay the foundations of the theory of a social contract between the governed and the governor.

Hugo Grotius based his philosophy of international law on natural law. He wrote that "even the will of an omnipotent being cannot change or abrogate" natural law, which "would maintain its objective validity even if we should assume the impossible, that there is no God or that he does not care for human affairs." (De iure belli ac pacis, Prolegomeni XI). This is the famous argument etiamsi daremus (non-esse Deum), that made natural law no longer dependent on theology. John Locke incorporated natural law into many of his theories and philosophy, especially in Two Treatises of Government. Locke turned Hobbes' prescription around, saying that if the ruler went against natural law and failed to protect "life, liberty, and property," people could justifiably overthrow the existing state and create a new one.

The Belgian philosopher of law Frank van Dun is one among those who are elaborating a secular conception of natural law in the liberal tradition. There are also emerging and secular forms of natural law theory that define human rights as derivative of the notion of universal human dignity. The term "human rights" has replaced the term " natural rights " in popularity, because the rights are less and less frequently seen as requiring natural law for their existence.
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