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.

I'm dying, and I'm having fun.

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

No matter how bad things are, you can always make things worse. At the same time, it is often within your power to make them better

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.

Put on your own oxygen mask before assisting others.

You can't control the cards you're dealt, just how you play the hand.