We have not confronted forcefully enough the intolerance, sectarianism, and hopelessness that feeds violent extremism in too many parts of the globe.

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.

Trying to change the outside by making changes to the outside, is like trying to make your lips red in your reflection by putting lipstick on the mirror!

As for me, I am a watercolor. I wash off.

The Bible is no lazy man's book! Much of its treasure, like the valuable minerals stored in the bowels of the earth, only yield up themselves to the diligent seeker.

In the last few decades, mankind has sinned terribly against the law of natural selection. We haven't just maintained life unworthy of life, we have even allowed it to multiply.

Why are we deforesting for pulp and paper when we have a logical and efficient solution in plants like kenaf or bamboo? It doesn't make sense to me at all.

Politics come from man. Mercy, compassion, and justice come from God.

Distance running to a professional athlete in my day was five laps around the field. And you stopped each lap to take your pulse.

Philosophy is true mother of the arts [of science].

There were thirst and hunger, and you were the fruit. There were grief and the ruins, and you were the miracle.

Chance is an element of life. What I try to do is study what I call the mechanics of reality as carefully as I can.