Every man's life lies within the present; for the past is spent and done with, and the future is uncertain.

In love we often doubt what we most believe.

Peace comes when you talk to the guy you most hate. And that's where the courage of a leader comes, because when you sit down with your enemy, you as a leader must already have very considerable confidence from your own constituency.

As a scientist, I want to go to Mars and back to asteroids and the Moon because I'm a scientist. But I can tell you, I'm not so naive a scientist to think that the nation might not have geopolitical reasons for going into space.

I suffer more from the humiliations inflicted by my country than from those inflicted on her.