It’s not enough to shelve your own competitive streak. You have to try, consciously, to help others succeed.

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.

Stories shared in your kitchen will strengthen your family than the stories shared your bedroom

Passion - eventually it cools.

If you don’t deal with the past, the past deals with you.

Just because he might not know the difference between a spanner and a hammer, didn’t mean a good dose of Heroic kicking wouldn’t solve the same problem.

Some men storm imaginary Alps all their lives and die in the foothills cursing difficulties which do not exist.

Within 10 years it will be impossible to travel to the North Pole by dog team. There will be too much open water.

The pleasure of one's effect on other people still exists in age - what's called making a hit. But the hit is much rarer and made of different stuff.

As one person said to me , Republicans know [Donald] Trump is a stain on their party.

The tongue is the most remarkable. For we use it both to taste out sweet wine and bitter poison, thus also do we utter words both sweet and sout with the same tongue.

And it's one thing to give people freedom and something else to deny the rights of Christians to assert their faith in order to keep Hindus from feeling upset.