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.

When there’s an elephant in the room introduce him.

Go out and do for others what somebody did for you.

Brick walls are there for a reason. The brick walls aren't there to keep us out. The brick walls are there to show us how badly we want things.

We can't change it. We have to decide how we'll respond.

There's a lot of talk these days about giving children self-esteem. It's not something you can give; it's something they have to build.

I don't suffer from an abundance of politeness.