At 19, your brain hasn't finished wiring itself. So the first time you have a good friend die, most people don't go through that at 19. Soldiers do. They're facing life in this accelerated, compressed form, and a lot of times, they're not ready for it.

Who wants a life of ease? And who wants a life in the office that you hate, and who wants to play golf?

No one will remember that President Obama supported the Arab Spring if it eventually fails and the region collapses back into the political Dark Ages. If we actively engage these movements with advice, with money, and, when necessary, with military force, then we get a vote in how it all turns out.

Right now, America doesn't ask us to do anything besides pay taxes. We don't even have to vote. But as psychologists will tell you, when you have to sacrifice for something, you value it more. What about national service for young people? Everybody between 18 and 24 could spend a year or two working for this country in some capacity. It'd be an amazing thing. And it would mix this country racially, culturally, economically.

When you're scared, you're still hanging on to life. When you're ready to die, you let it go. A sort of emptying out occurs, a giving up on the world that seems oddly familiar even if you've never done it before.

How do men act on a sinking ship? Do they hold each other? Do they pass around the whisky? Do they cry?

Ironically, though our society of affluence brings safety and stability, it doesn't bring psychological health. As wealth goes up, suicide and depression rates tend to go up. I read one study that compared women in North America with women in Nigeria, and the group with the highest rates of depression was urban North American women, which is the wealthiest. Now, there are obviously huge stresses that come with poverty, but the poorer the society, the more collaborative people have to be.