"The most important causes of political arrangements and acts are found in the nature and behavior of man."

“Then what explains war among states? Rousseau's answer is really that war occurs because there is nothing to prevent it.”

“If we gather more and more data and establish more and more associations, however, we will not finally find that we know something. We will simply end up having more and more data and larger sets of correlations.”

“To build a theory of international relations on accidents of geography and history is dangerous.”

“Each state pursues its own interest's, however defined, in ways it judges best. Force is a means of achieving the external ends of states because there exists no consistent, reliable process of reconciling the conflicts of interest that inevitably arise among similar units in a condition of anarchy.”

“It is not true that were the Soviet Union to disappear the remaining states could easily live in peace.”

“Differences in the incidence of destruction and "death" do not account for the reluctance to refer to international politics as a harmonious realm, while competitive economies are often so described. Instead, one may say that the standards of performance now applied to international political systems are higher, or at least widely different. As John Maynard Keynes once remarked, those who believe that unhampered processes of natural selection lead to progress do not "count the cost of the struggle" . In international politics, we often count nothing but the costs of the struggle.”