You can't change the bricks, and together, you still have to build a wall.

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.

VOA no longer felt like a sanctuary but rather a mirage and we were desert wanderers.

The hardest thing to face in life is the truth about yourself

This is one of the two great labyrinths into which human minds are drawn: the question of free will versus predestination.

Bare hands grip success better than kid gloves. Be thorough in all things, no matter how small or distasteful! The man who counts his hours and kicks about his salary is a self-elected failure.

I'm at the stage in my pregnancy where I don't feel pregnant. You feel very, 'Oh yeah, I'm pregnant, ' because you're over the morning sickness and it's not too uncomfortable. It's fun.

Nothing short of the Almighty Power of God can Save us - it is not in our Numbers, our Union, or our Valour that I dare trust.

My wife's not only my best friend but she's damn hot, too.

Every passing year brings us more past futures.

The phone conversation where I haven't had a smoke, it's like trying to talk without using adverbs.

The doctors told me I'd be fine if I play only golf and tennis doubles for the rest of my life. But I dive. I dogsled. I trek. I guess I'll have surgery.