In three words I can sum up everything I've learned about life — It goes on.

There are two kinds of teachers: the kind that fill you with so much quail shot that you can't move, and the kind that just gives you a little prod behind and you jump to the skies.

To be a poet is a condition, not a profession.

Space ails us moderns: we are sick with space.

The concentration of U.S. income and wealth in the hands of the very rich is a new development in my lifetime.

The economics profession advances by one confusing financial disaster at a time.

I'd seen musicians act, and it scares me. And they make more money than me.

People should decide 'are you willing to spend all this money to go to Mars?' I think the average person on the ground would never spend that amount of money - they have to spend it on something that makes sense and this is definitely saving our planet.