People demand freedom of speech as a compensation for the freedom of thought which they seldom use.

I'm not a gangster, I'm far from it.

If you don't fail at least 90 percent of the time, you're not aiming high enough.

I would like to fly in space.Absolutely.That would be cool.I used to just do personally risky things， but now I’ve got kids and responsibilities， so I can’t be my own test pilot.That wouldn’t be a good idea.But I definitely want to fly as soon as it’s a sensible thing to do.