Climate change constitutes a serious threat to global security.

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.

Writers are not here to conform. We are here to challenge. We're not here to be comfortable—we're here, really, to shake things up. That's our job.

Some of us have hearts, you know. Some of us don't give up on true love.

Never judge yourself so harshly that you never arise from the ashes of life.

The less intelligent the white man is, the more stupid he thinks the black.

We are becoming who we will be-forever.

If you're worth over $50m you should have to dress like that guy on the Monopoly box. The super-rich shouldn't get all the benefits of looking like a regular guy.

The worst possible turn can not be programmed. It is caused by coincidence.

Going to a charity tea party and thinking that you've done your bit toward putting an end to social inequity in the world.

The multiplication of public offices, increase of expense beyond income, growth and entailment of a public debt are indications soliciting the employment of the pruning knife.

Opportunities don't knock, they whisper. So shut up and listen.