Of course, you'll have to meet the physical and psychological demands. A space walk takes a lot of energy.

One day, people will be able to buy tickets to visit space.

I'm Chinese-American, of course, and so it's very interesting to see China actually launch their own astronauts, becoming the third nation, following the United States and Russia, to do so.

I think it's good to have competition. Now we have a third country that can launch astronauts, so it's good for all of us. It makes us a little bit more competitive and wanting to be the leader.

I hope that China will continue with space exploration. It would be logical to have international co-operation. I hope that it will come about and that I can be involved in it.

I loved flying as much as I thought I would and continue to fly aircraft.

As commander I was responsible for the overall success of the mission, and so I had to know at least a little bit about everything.

Space is very unforgiving business

Tinkering is something we need to know how to do in order to keep something like the space station running. I am a tinkerer by nature.

My running ambition is to keep doing it until I'm way past the point where I have any business running. Just to keep doing it throughout my whole life—to stay fit and feel good.

Black holes are where God divided by zero.

I found myself with a perseverance worthy of a much better cause.

There would be no debate about who was the best footballer the world had ever seen - me or Pele. Everyone would say me.

[A]ny notion of the serious life of leisure, as well as men's taste and capacity to live it, had disappeared. Leisure became entertainment.

Internal improvement and the diffusion of knowledge, so far as they can be promoted by the constitutional acts of the Federal Government, are of high importance.

The real deal is always going to win in the end.

I can see only one safe rule for the historian: that he should recognize in the development of human destinies the play of the contingent and the unforeseen.

I just love to sing, so like my dad's advice when I was younger - anytime you get a chance to sing, just go out there and do it! I truly just love the actual singing.

If we get the donations, I think we're going to raise a significant amount of money; some will be used for some administered costs, but the public portion of that will go directly into grants.

The devil does not tempt unbelievers and sinners who are already his own.