The only limit to our realization of tomorrow will be our doubts of today.

It really matters whether people are working on generating clean energy or improving transportation or making the Internet work better and all those things. And small groups of people can have a really huge impact.

The desire to get rich is a natural human instinct, and it's not something to be ashamed of.

There are some things one remembers even though they may never have happened.

I don't follow trends. I create them.