Ingenuity, knowledge, and organization alter but cannot cancel humanity's vulnerability to invasion by parasitic forms of life. Infectious disease wh… - William Hardy McNeill

I am old enough to remember well the depression years of the middle 1930s, when economists were quite unable to agree on what public policy should be, and when President Hoover, in need of advice, turned by preference to sociologists to study and illuminate recent social trends. The circumstances of the 1980s seem similar; perhaps contemporary confusions and dismay will mark the dethronement of economics from its privileged place among the social sciences — but perhaps not.

When terms... evolve and change definition with time; and when the social reality which terms are intended to organize and render intelligible is also seen to be in flux, capturing the truth in a net of words becomes a matter of intuition and style more than of any scientific method that can be replicated by others and made to achieve the same result every time someone asks the same question, or undertakes the same operations.

Religious history also offers another striking parallel between Rome and China. The Buddhist faith began to penetrate the Han empire in the first century A.D., and soon won converts in high places. Its period of official dominance in court circles extended from the third to the ninth centuries A.D. This obviously parallels the successes that came to Christianity in the Roman empire during the same period.