There is no difference in a country between military, economic, and political affairs. It's useful for Business Insider to divide things that way. That's useful for a college program. But a country is a country. How do you understand China's economy without China's army? If you take these all into account you're ready to explain a question like, "How come the US doesn't have a debt problem?"

Every theory I've seen that contains an explanation of war fails. I think they fail for the same reason that explanations of sex fail. War derives from things so deep and so complex, I'm thoroughly baffled by it at the end of the day.

In a way, we can have a much easier discussion about the future of technology than we can about why a young man kills another man in a war.

If you go through the list of things that are not possible you're left with a very finite amount of possibilities. The fancy name for this is constraint theory. It's a nonquantitative model, but it's a field of mathematics.

Recent presidents have gone off on ad hoc adventures. They have set unattainable goal because they have framed the issue incorrectly, as they believed their own rhetoric.

Politicians are enormously smart and rational. They don't have the same interests as businessmen ... But a man rises to the top of the United States. He's clawed his way out of 330 million people. OK. He didn't do that because he was dumb, or lucky, or something like that. He understands power. And he understands how to take it. And he understands how to keep it.

When I went to war, I did not go making geopolitical calculations. I went to war with a lust.