Leadership is intangible, and therefore no weapon ever designed can replace it.

I am convinced that the best service a retired general can perform is to turn in his tongue along with his suit and to mothball his opinions.

With the monstrous weapons man already has, humanity is in danger of being trapped in this world by its moral adolescents.

This is as true in everyday life as it is in battle: we are given one life and the decision is ours whether to wait for circumstances to make up our mind, or whether to act, and in acting, to live.

The world is enormously dangerous and scary. I worry very much for my daughter. I'm not sure we're in control any more, and I think the Internet is partly responsible for that.

There's a big difference between industrializing production of tractors and industrializing production of food. We like technology, but we really like technology that allows us to do better what nature does itself.

If you run an Internet search on Vietnam and the war, most of the information you get begins at about 1962. I think this is telling. It is missing the whole period that led up to the reasons the war happened in the first place.

I think social media has reinvigorated people's enthusiasm to be active and to engage.