As you lecture, you keep watching the faces, and information keeps coming back to you all the time.

The Vietnamese have a secret weapon. It's their willingness to die beyond our willingness to kill. In effect, they've been saying, You can kill us, but you'll have to kill a lot of us; you may have to kill all of us. And, thank heaven, we are not yet ready to do that.

The concept of war crimes is an American invention.

There's life all over this universe, but the only life in the solar system is on earth, and in the whole universe we are the only men.

I tell my students to try early in life to find an unattainable objective.

Not all living creatures die. An amoeba, for example, need never die; it need not even, like certain generals, fade away. It just divides and becomes two new amoebas.

I think I know what is bothering the students. I think that what we are up against is a generation that is by no means sure that it has a future.