I think we want to see new voices and new ideas emerge - that's part of the reason why term limits are a really useful thing.

You can’t let your failures define you. You have to let your failures teach you.

Change will not come if we wait for some other person or some other time. We are the ones we've been waiting for. We are the change that we seek.

Keep exploring. Keep dreaming. Keep asking why. Don’t settle for what you already know. Never stop believing in the power of your ideas, your imagination, your hard work to change the world.

When ignorant folks want to advertise their ignorance, you don't really have to do anything, you just let them talk.

Just because we have the best hammer does not mean that every problem is a nail.

Change is never easy, but always possible.

Don’t ever let anybody tell you that your efforts don’t matter or that your voice doesn’t count. Don’t ever believe that you can’t make a difference. You have.

Where you are right now doesn't have to determine where you'll end up.

Learning to stand in somebody else's shoes, to see through their eyes, that's how peace begins. And it's up to you to make that happen. Empathy is a quality of character that can change the world.

If somebody is different from you, that's not something you criticize, that's something that you appreciate.

Money is not as good as power, but power is as good as money.

In the twentieth century nothing can better cure the anthropocentrism that is the author of all our ills than to cast ourselves into the physics of the infinitely large (or the infinitely small).

The only thing that might have annoyed some mathematicians was the presumption of assuming that maybe the axiom of choice could fail, and that we should look into contrary assumptions.

Can't do it, simply cause underneath 'em is too ugly.

The secret of a balanced life is to live each moment in the right spiritual frame of mind.

Our present era, to my mind, is characterized by a profound forgetting of the past. "The future, the future, the future." The 21st century, all the technology obsession.

I'm not going to be in a relationship that I don't fully trust.

I never want to discourage anyone who chooses the arts as a path because it's hard enough to make it in this business or even get ahead.

Humour is not a postscript or an incidental afterthought - rather it is a serious and weighty part of the world's economy.

And he that is taught to live upon little, owes more to his father's wisdom, than he that has a great deal left him, does to his father's care.