The natural rights with which we have been dealing are, however, inseparably connected, in the very person who is their subject, with just as many respectiveduties; and rights as well as duties find their source, their sustenance and their inviolability in the natural law which grants or enjoins them.Since men are social by nature they are meant to live with others and to work for one another’s welfare. A well-ordered human society requires that men recognize and observe their mutual rights and duties. It also demands that each contribute generously to the establishment of a civic order in which rights and duties are more sincerely and effectively acknowledged and fulfilled.