"Mystery creates wonder and wonder is the basis of man's desire to understand."

"The greatest value of space exploration is not in the discoveries we make, but in the discoveries we make about ourselves."

"I believe that every human has a finite number of heartbeats. I don't intend to waste any of mine running around doing exercises."

"It suddenly struck me that that tiny pea, pretty and blue, was the Earth. I put my thumb over it and I could make the Earth disappear. I didn't feel like a giant. I felt very, very small."

"I believe that the Good Lord gave us a finite number of heartbeats and I'm damned if I'm going to use up mine running up and down a basketball court."