II. Natural, Common, and Civil Law.
The law of nature is that law which nature teaches to all animals. For this law does not belong exclusively to the human race, but belongs to all animals, whether of the earth, the air, or the water.
Hence comes the union of the male and female, which we term matrimony; hence the procreation and bringing up of children. We see, indeed, that all the other animals besides men are considered as having knowledge of this law.
1. Civil law is thus distinguished from the law of nations. Every community governed by laws and customs uses partly its own law, partly laws common to all mankind. The law which a people makes for its own government belongs exclusively to that state and is called the civil law, as being the law of the particular state.
But the law which natural reason appoints for all mankind obtains equally among all nations, because all nations make use of it. The people of Rome, then, are governed partly by their own laws, and partly by the laws which are common to all mankind. We will take notice of this distinction as occasion may arise.
2. Civil law takes its name from the state which it governs, as, for instance, from Athens; for it would be very proper to speak of the laws of Solon or Draco as the civil law of Athens.
And thus the law which the Roman people make use of is called the civil law of the Romans, or that of the Quirites; for the Romans are called Quirites from Quirinum. But whenever we speak of civil law, without adding the name of any state, we mean our own law; just as the Greeks, when “the poet” is spoken of without any name being expressed, mean the great Homer, and we Romans mean Virgil.
The law of the nations is common to all mankind, for nations have established certain laws, as occasion and the necessities of human life required. Wars arose, and in their train followed captivity and then slavery, which is contrary to the law of nature; for by that law all men are originally born free. Further, by the law of nations almost all contracts were at first introduced, as, for instance, buying and selling, letting and hiring, partnership, deposits, loans returnable in kind, and very many others.
3. Our law is written and unwritten, just as among the Greeks some of their laws were written and others were not written. The written part consists of leges (lex), plebiscita, senatusconsulta, constitutiones of emperors, edicta of magistrates, and responsa of jurisprudents [i.e., jurists].
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