Good people do not need laws to tell them to act responsibly, while bad people will find a way around the laws.

It is more shameful to distrust our friends than to be deceived by them.

Ambition is the last refuge of the failure.

The purpose of going to Mars is for humans to first begin to occupy, permanently, another planet in the solar system. The astronauts or pilgrims, whatever you might call them, are going to be very historically unique human beings.

If we find life out there, and it's not us, we will deem it not intelligent. But what may be equally as likely is that we find life that's vastly more intelligent than we are. If that's the case, we are putty in their hands.