Apologize when you screw up and focus on other people, not on yourself.

Never, ever underestimate the importance of having fun.

An injured lion wants to know if he can still roar.

Call home at least once a week. It's a proven fact that we call home less the older we get. And that's wrong. It should be the other way around. As we get older, our parents get older.

We've placed a lot of emphasis in this country on the idea of people's rights. That's how it should be, but it makes no sense to talk about rights without also talking about responsibilities.

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.

Walls aren't put in our life to stop us, they are there to test how much we really want somthing.