HANS J. MORGENTHAU
FOUR TASKS OF DIPLOMACY
Diplomacy [is] an element of national power. The importance of diplomacy for the preservation of international peace is but a particular aspect of that general function. For a diplomacy that ends in war has failed in its primary objective: the promotion of the national interest by peaceful means. This has always been so and is particularly so in view of the destructive potentialities of total war. Taken in its widest meaning, comprising the whole range of foreign policy, the task of diplomacy is fourfold: (1) Diplomacy must determine its objectives in the light of the power actually and potentially available for the pursuit of these objectives. (2) Diplomacy must assess the objectives of other nations and the power actually and potentially available for the pursuit of these objectives. (3) Diplomacy must determine to what extent these different objectives are compatible with each other. (4) Diplomacy must employ the means suited to the pursuit of its objectives.
Failure in any one of these tasks may jeopardize the success of foreign policy and with it the peace of the world. A nation that sets itself goals which it has not the power to attain may have to face the risk of war on two counts. Such a nation is likely to dissipate its strength and not to be strong enough at all points of friction to deter a hostile nation from challenging it beyond endurance. The failure of its foreign policy may force the nation to retrace its steps and to redefine its objectives in view of its actual strength. Yet it is more likely that, under the pressure of an inflamed public opinion, such a nation will go forward on the road toward an unattainable goal, strain all its resources to achieve it, and finally, confounding the national interest with that goal, seek in war the solution to a problem that cannot be solved by peaceful means. A nation will also invite war if its diplomacy wrongly assesses