I've had a chance to see something that is way outside everybody else's frame of reference and gives a perspective that is very different from everyone else's.

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.

It is my conviction that killing under the cloak of war is nothing but an act of murder.

Backbite: To ''speak of a man as you find him'' when he can't find you.

I find that here in the States, audiences are generally less knowledgeable, from the cognitive point of view, though they are emotionally more receptive.

To solve an interesting problem, start by finding a problem that is interesting to you.

What we experience in Colombia is fratricide, we fight ourselves and it demonstrates the priority of hatred over peace and reconciliation.

Although there has always been a hermeneutic problem in Christianity, the hermeneutic question today seems to us a new one.

Love brings freedom. Loyalty brings slavery.

My mom was always active. She was always an active voter, whether it was local, state, or federal elections. My mom would take us to polling locations when we were kids.

In any democratic country you have more than one view.

You want to compete, and you want to compete at the highest level.