When you have a hammer, all problems start to look like nails.

In my view, America has never had the opportunity to enter paradise. Europe enjoys the paradise it enjoys, in part because the United States provides the overall security that allows Europe to live in a system where military power is not a major issue.

If a caterpillar doesn't know its future has wings, it hardly experiences itself as land-bound.

The thing that I would say is that U.S. power is not eternal. I am not saying that it won't come to an end. Because it will.

I believe it is still true that conflicts among major powers usually stem from geopolitical rivalries but rarely from economic competition.

Foreign policy is like hitting a baseball: if you fail 70 percent of the time, you go to the Hall of Fame.

When you have a hammer, all problems start to look like nails.