I do not want to believe in God. Therefore I choose to believe in that which I know is scientifically impossible, spontaneous generation leading to evolution.

Nuclear weapons offer us nothing but a balance of terror, and a balance of terror is still terror.

We have to get rid of those nuclear weapons.

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.

I can conceive of no nightmare so terrifying as establishing communication with a so-called superior (or, if you wish, advanced) technology in outer space.

When you have no experience of pain, it is rather hard to experience joy.

If the germ plasm wants to swim in the ocean, it makes itself a fish; if the germ plasm wants to fly in the air, it makes itself a bird. If it wants to go to Harvard, it makes itself a man. The strangest thing of all is that the germ plasm that we carry around within us has done all those things. There was a time, hundreds of millions of years ago, when it was making fish. Then ... amphibia ... reptiles ... mammals, and now it's making men.