“And that brings me to one last point. I've got a simple message for all the dedicated and patriotic federal workers who have either worked without pay, or who have been forced off the job without pay for these last few weeks. Including most of my own staff. Thank you. Thanks for your service. Welcome back. What you do is important. It matters. You defend our country overseas, you deliver benefits to our troops who earned them when they come home, you guard our borders, you protect our civil rights, you help businesses grow and gain footholds in overseas markets. You protect the air we breathe, and the water our children drink, and you push the boundaries of science and space, and you guide hundreds of thousands of people each day through the glories of this country. Thank you. What you do is important, and don't let anybody else tell you different.”

“We now live in a world where the most valuable skill you can sell is knowledge.”

“I listened to a Republican colleague work himself into a lather over a proposed plan to provide school breakfasts to preschoolers. Such a plan, he insisted, would crush their spirit of self-reliance. I had to point out that not too many five-year-olds I knew were self-reliant, but children who spent their formative years to hungry to learn could very well end up being charges of the state.”

“Like a tourist, I watched the range of human possibility on display, trying to trace out my future in the lives of the people I saw, looking for some opening through which I could reenter.”

“A nation ringed by walls will only imprison itself.”

“How could we judge other men until we had stood in their shoes?

“Our democracy is threatened whenever we take it for granted.”

“I only know what I have seen. What I have not seen doesn't make my heart heavy.”

“like politics?” I was familiar with the question, a variant on the questions asked of me years earlier, when I’d first arrived in Chicago to work in low-income neighborhoods. It”

“The study of law can be disappointing at times, a matter of applying narrow rules and arcane procedure to an uncooperative reality; a sort of glorified accounting that serves to regulate the affairs of those who have power--and that all too often seeks to explain, to those who do not, the ultimate wisdom and justness of their condition. But that's not all the law is. The law is also memory; the law also records a long-running conversation, a nation arguing with its conscience.”

“This election is about the past vs. the future. It's about whether we settle for the same divisions and distractions and drama that passes for politics today or whether we reach for a politics of common sense and innovation, a politics of shared sacrifice and shared prosperity. There are those who will continue to tell us that we can't do this, that we can't have what we're looking for, that we can't have what we want, that we're peddling false hopes. But here is what I know. I know that when people say we can't overcome all the big money and influence in Washington, I think of that elderly woman who sent me a contribution the other day, an envelope that had a money order for $3.01 along with a verse of scripture tucked inside the envelope. So don't tell us change isn't possible. That woman knows change is possible. When I hear the cynical talk that blacks and whites and Latinos can't join together and work together, I'm reminded of the Latino brothers and sisters I organized with and stood with and fought with side by side for jobs and justice on the streets of Chicago. So don't tell us change can't happen. When I hear that we'll never overcome the racial divide in our politics, I think about that Republican woman who used to work for Strom Thurmond, who is now devoted to educating inner city-children and who went out into the streets of South Carolina and knocked on doors for this campaign. Don't tell me we can't change. Yes, we can. Yes, we can change. Yes, we can. Yes, we can heal this nation. Yes, we can seize our future. And as we leave this great state with a new wind at our backs and we take this journey across this great country, a country we love, with the message we carry from the plains of Iowa to the hills of New Hampshire, from the Nevada desert to the South Carolina coast, the same message we had when we were up and when we were down, that out of many, we are one; that while we breathe, we will hope. And where we are met with cynicism and doubt and fear and those who tell us that we can't, we will respond with that timeless creed that sums up the spirit of the American people in three simple words -- yes, we can.”

“As president, I believe that robotics can inspire young people to pursue science and engineering. And I also want to keep an eye on those robots in case they try anything.”

“Winter came and the city [Chicago] turned monochrome -- black trees against gray sky above white earth. Night now fell in midafternoon, especially when the snowstorms rolled in, boundless prairie storms that set the sky close to the ground, the city lights reflected against the clouds”

“in a climate of constant technological change.”

“Democracy demands that the religiously motivated translate their concerns in to universal, rather than religion-specific, values... it requires that their proposals be subject to argument and amenable to reason. Now I may be opposed to abortion for religious reasons, to take one example, but if I seek to pass a law banning the practice, I cannot simply point to the teachings of my church or evoke God's will. I have to explain why abortion violates some principle that is accessible to people of all faiths, including those with no faith at all.”