If Iran cheats, the world will know it.

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.

Your disbelief in God does not determine His existence. God is. Period. Whether you believe it or not.

Lord, today I ask for a renewed sense of purpose in my smaller daily choices, knowing that how I spend each moment is how I live my life. Every choice matters.

The abundance of small things, it'll bury you.

When I think good thoughts, I feel that man is not, after all, so bad.

He exuded wisdom-even the wisest...were pale, flickering candles next to the nourishing solar illumination of [his] insights.

Are there any swamps in Oklahoma? Yes, there is. It's called Tulsa.

We do not believe any group of men adequate enough or wise enough to operate without scrutiny or without criticism.

It's your eyes. They're ... more serious than they used to be. Like they've seen things they shouldn't have.

Nuclear arms kill many people all at once, but other weapons kill many people, little by little, every day, everywhere in the world.

Every person you see has stories, and every person you see has a few that would break your heart. We deserve each other's respect simply because we've survived all we have and kept going anyway.