“The two most obvious types of power are the military and the economic, though in primitive society the power of the priest, partly because he dispenses supernatural benefits and partly because he dispenses supernatural beliefs and partly because he establishes public order by methods less arduous than those of the soldier, vies with that of the soldier and landlord. The chief difference between the agrarian civilisations, which lasted from the rise of ancient Babylon and Egypt to the fall of European feudalism, and the commercial and industrial civilisations of today is that in the former military power is primary, and in the latter it has become secondary, to economic power. In agrarian civilisations the soldier becomes the landlord. In more primitive periods he may claim the land by his own military prowess. In later periods a grateful sovereign bestowed land upon the soldiers who defended his realm and consolidated his dominion. The soldier thus gained the economic security and the social prestige which could be exploited in further martial service to his sovereign. The business man and industrial overlord are gradually usurping the position of eminence and privilege once held by the soldier and the priest.”
– Reinhold Niebuhr. Moral Man and Immoral Society.