The 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.
The superpowers often behave like two heavily armed blind men feeling their way around a room, each believing himself in mortal peril from the other, whom he assumes to have perfect vision.
A leader who confines his role to his people's experience dooms himself to stagnation; a leader who outstrips his people's experience runs the risk of not being understood.