If you lose yourself to rage in the complexity of battle, you are going to be lost.

Constraint theory argues a number of things. First, that the impossible has to be identified. Second, that the actor is then constrained by circumstances to act a certain way. For example, should we invade ISIS? Can we invade ISIS? What would it take to invade ISIS? Once you ask that question you discover the price of that option and then you take a look at American politics and see that the country is probably not prepared to invest the 2 to 3 million people that it would take to defeat ISIS and the insurgency afterwards. All right, so that's not going to happen.

One of the great famines in human history took place during the Chinese Cultural Revolution. [At the same time] Western journalists were reporting how marvelously Chinese society was working. We know so little [about what happens in China].

Idealism is frequently another word for self-righteousness, a disease that can only be corrected by a profound understanding power in its complete sense.

I think the personal and psychological aspects of war remain the same. War is about killing and dying. A man or woman stands at the post and there is a very real possibility of dying in the next five minutes. Whether he dies or not depends partly on him and partly on luck, and yet he must continue to function.

The warrior must continue to make decisions in the face of extreme circumstances. He cannot afford to get angry or frightened.

Now if you can recognize and memorize a grandmaster's game, and you have the respect to understand [Zimbabwean president Robert] Mugabe who has survived past anyone's expectations, and make the simple assumption it wasn't an accident, and you understand why he did what he did, now you're ready to predict ... The key to forecasting is to understand both the constraints nations are under and the manner in which the struggle for power shapes leaders.