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Rh are considered null. Not, however, by natural right; because, as regards natural right, all men are equal." And Florentinus: "Liberty is the natural faculty of that which it is permitted to any one to do, unless something has been prohibited to him by force or law. Slavery is an institution of the law of nations, by which any one is subjected to the rule of another, against nature. Servi are so called because military commanders are wont to sell captives, and so to preserve (servare) them and not kill them." The doctrine, therefore, gets into the Institutes of Justinian: "Slavery is the institute of the law of nations by which a human being is subjected to another's control against nature." These propositions in the law, remained, however, entirely barren, and were not different from the academical utterances of the philosophers. It was the voice of reason and conscience recognizing a grand abstract doctrine, but without power to solve the social problems which would arise if that doctrine should be in any measure admitted into the existing order. The Christians alone seem to carry on the doctrine as something more than a pious hope, something not more distant than any other feature of the kingdom of heaven, and easily realizable in that kingdom. The vague elements of social and political innovation in the revolt of the Donatists and the Bagaudes bear witness to the extent to which some such doctrines had been popularized. The latter had a very naive definition of natural rights, and, on the whole, as good a one as has ever been given. "Natural rights are born with us, about which nothing is said."