The limits of power: Knowledge, ethics, and foreign policy in Hans J. Morgenthau's international theory

Hans J. Morgenthau's contribution to international relations and political theory appears to have been fully recognized to date. However, his ideas have undergone surprisingly little comprehensive investigation: an attitude that made it possible to grasp only a few aspects of his reflections. The main argument of this article is that the main area of inquiry in Morgenthau's scholarship - international politics and foreign policy - is based on general considerations regarding the role of reason in politics and the limits of knowledge of the social universe. Not only does the question of the possibility of such knowledge lie at the root of his considerations on political action, but it also forms the mainspring of his reflection on ethics. Through an inquiry into the red thread that tightly links his diverse body of thought on social sciences, ethics, and foreign policy, the article aims to show that Morgenthau was a systematic political thinker who set out from theoretical observations on the limits of knowledge to develop particular insights into ethics and, from there, a particular notion of how foreign policy should be conducted. In other words, Morgenthau established links of essential continuity between knowledge, ethics, and action.