The general societies of men are absolutely requisite for the subsistence of the species; and the public conveniency, which regulates morals, is inviolably established in the nature of man, and of the world, in which he lives.
 David Hume, An Enquiry Concerning the Principles of Morals (1751). copy citation

Context

“The foundation, I own, of such societies is frivolous; and the laws are, in a great measure, though not altogether, capricious and arbitrary. So far is there a material difference between them and the rules of justice, fidelity, and loyalty. The general societies of men are absolutely requisite for the subsistence of the species; and the public conveniency, which regulates morals, is inviolably established in the nature of man, and of the world, in which he lives. The comparison, therefore, in these respects, is very imperfect. We may only learn from it the necessity of rules, wherever men have any intercourse with each other. They cannot even pass each other on the road without rules.” source