As an astronaut, especially during launch, half of the risk of a six-month flight is in the first nine minutes.

Spaceflight isn't just about doing experiments, it's about an extension of human culture.

Our role is to develop techniques that allow us to provide emergency life-saving procedures to injured patients in an extreme, remote environment without the presence of a physician.

Don't let life randomly kick you into the adult you don't want to become

Almost everything worthwhile carries with it some sort of risk.

Decide in your heart of hearts what really excites and challenges you, and start moving your life in that direction

Every single day you're the result of what you did on the days prior.

Focus on the journey, not on arriving at a certain destination.

Remember, nobody changes the world on their own.

Every decision you make, from what you eat to what you do with your time tonight, turns you into who you are tomorrow and the day after that.

The cool things about space is when you put your pants on here, you can put them on two legs at a time.

i won't be happy until i'm famous like God

A push-up bra is to a woman’s chest … what 'breathing-in' is to a man’s stomach.

Envy-Thy art blindness

The sexual energies returned, when they're not evolved, are still linked with violence and the fear of power - the fear of women.

No country will reach its full potential if its female citizens do not enjoy full equality.

Voting is easy and marginally useful, but it is a poor substitute for democracy, which requires direct action by concerned citizens.

The cynic, a parasite of civilization, lives by denying it, for the very reason that he is convinced that it will not fail.

Like my mother said, you can't go back to holding hands

The ideal visions of one age eventually are seen as its excesses by the next.

I became at peace with the darkness or the personality that I have. I am usually pretty funny and happy.