The Wealth of Nations by Part 5 Chapter 1 Page 66

greater number of people than any of them. His military power is greater than that of any of them. In time of war they are all of them naturally disposed to muster themselves under his banner, rather than under that of any other person, and his birth and fortune thus naturally procure to him some sort of executive power. By commanding, too, the united force of a greater number of people than any of them, he is best able to compel any one of them who may have injured another to compensate the wrong. He is the person, therefore, to whom all those who are too weak to defend themselves naturally look up for protection. It is to him that they naturally complain of the injuries which they imagine have been done to them, and his interposition in such cases is more easily submitted to, even by the person complained of, than that of any other person would be.