On Sept. 11, 2001, thousands of first responders heroically rushed to the scene and saved tens of thousands of lives. More than 400 of those first responders did not make it out alive. In rushing into those burning buildings, not one of them asked, 'What God do you pray to?' What beliefs do you hold?'

If someone tells me they skied all day and never fell down, I tell them to find another mountain.

I think that most of the candidates [for presidency] can't run the railroad, and I still worry that whoever gets elected will have policies designed for political rather than practical reasons.

You must first be willing to fail — and you must have the courage to go for it anyway.

By speeding the transition to cleaner energy, we can improve the lives of billions of people, while also reducing the risks we face from a changing climate.

You're entitled to your own opinions, but not your own facts.

I've always wondered if people who block each other from expressing their opinions do so because they have so little confidence in their own. To me, encountering an opposing point of view is a chance to gain a deeper understanding of the issues at stake and develop my own point of view. But the first thing you've got to do is you've got to let people speak and you've got to listen. And that's what the first amendment is all about. That's what really distinguishes this country from others.