Civilization will end within 15 or 30 years unless immediate action is taken against problems facing mankind.

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.

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

Most modern biologists, having reviewed with satisfaction the downfall of the spontaneous generation hypothesis, yet unwilling to accept the alternative belief in special creation, are left with nothing.

A physicist is an atom's way of knowing about atoms.

We have fallen in love with the body. That's that thing that looks back at us from the mirror. That's the repository of that lovely identity that you keep chasing all your life.

The thought that we're in competition with Russians or with Chinese is all a mistake, and trivial. We are one species, with a world to win.