The person who failed often knows how to avoid future failures.

Look for the best in everybody

Look, I'm going to find a way to be happy, and I'd really love to be happy with you, but if I can't be happy with you, then I'll find a way to be happy without you.

Brick walls let us prove how badly we want our dream and they stop those who don't want it enough. Brick walls let us show our dedication.

Take Time Out. It's not a real vacation if you're reading email or calling in for messages.

I understand the arguments about how the billions of dollars spent to put men on the moon could have been used to fight poverty and hunger on Earth. But, look, I'm a scientist who sees inspiration as the ultimate tool for doing good. When you use money to fight poverty, it can be of great value, but too often, you're working at the margins. When you're putting people on the moon, you're inspiring all of us to achieve the maximum of human potential, which is how our greatest problems will eventually be solved. Give yourself permission to dream.

We cannot change the cards we are dealt, just how we play the hand.