"I'm not a fan of the idea that we can just be complacent our way to progress."

"We've got to reject the notion that somehow America is in decline. We've got to reject the notion that our best days are behind us."

"I am my brother's keeper. I am my sister's keeper."

"The future belongs to the young people of the world, and they are the ones who are going to make a difference."

"When they go low, we go high."