You don't see the plug connected to the environment, so it looks like we're free, wandering around. Take the oxygen away, we all die immediately. Take plant life away, we die. And without the sun, all the plants die. So we are connected.

We talk about civilization as though it's a static state. There are no civilized people yet, it's a process that's constantly going on... As long as you have war, police, prisons, crime, you are in the early stages of civilization.

I don't want you to trust me, I want you to question everything I say.

We don't know how to live together on Earth, how the hell are we going to live together on Mars?

As long as superstition and ignorance prevail, humanity will fall short of eradicating war, poverty, and hunger.

Laws do not stop crime; they merely make noise about crime. They say 'Don't take anything that doesn't belong to you'. Well, that doesn't do anything.

Our times demand the declaration of the world's resources as the common heritage of all people.