"We were very, very lucky. We were in a very good place at a very good time."

"I put my thumb up and I could hide the whole Earth behind my thumb. I felt like a little tiny speck in this vast universe."

"Before we can conquer space, we must first conquer ourselves."

"I guess we all like to be recognized not for one piece of fireworks but for the ledger of our daily work."

"I think we're going to the moon because it's in the nature of the human being to face challenges."