I don't want to end up simply having visited this world.

It's the curiosity that drives me. It's making a difference in the world that prevents me from ever giving up.

Understand and be confident that each of us can make a difference by caring and acting in small as well as big ways.

You don’t have to know a lot of things for your life to make a lasting difference in the world. But you do have to know the few great things that matter, perhaps just one, and then be willing to live for them and die for them. The people that make a durable difference in the world are not the people who have mastered many things, but who have been mastered by one great thing.

I am only one, but still I am one. I cannot do everything, but still I can do something; and because I cannot do everything, I will not refuse to do something that I can do.

If you think you are too small to make a difference, you have obviously never been in bed with a mosquito!