Any international system must have two key elements for it to work. One, it has to have a certain equilibrium of power that makes overthrowing the system difficult and costly. Secondly, it has to have a sense of legitimacy.
Henry A. KissingerThe Vietnam War required us to emphasize the national interest rather than abstract principles. What President Nixon and I tried to do was unnatural. And that is why we didn't make it.
Henry A. KissingerThe key decision for a statesman is whether to commit his nation or not. There is no middle course. Once a great nation commits itself, it must prevail. It will acquire no kudos for translating its inner doubts into hesitation.
Henry A. Kissinger