“Each path to knowledge involves different rules and these rules are not interchangeable.”

“Let us keep that promise – that American promise – and in the words of Scripture -- hold firmly, without wavering, to the hope that we confess.”

“the words have been spoken during rising tides of prosperity and the still waters of peace. Yet every so often, the oath is taken amidst gathering clouds and raging storms...”

“Over the last fifteen months we've traveled to every corner of the United States. I've now been to fifty-seven states. I think, one left to go.”

“I realized that in some unspoken, still tentative way, she and I were already becoming a family.”

“I'm the President, but he's The Boss.”

“For in the end laws are just words on a page - words that are sometimes malleable, opaque, as dependent on context and trust as they are in a story or poem or promise to someone, words whose meanings are subject to erosion, sometimes collapsing in the blink of an eye.”

“My heart is filled with love for this country.”

“In my daughters I see her every day, her joy, her capacity for wonder. I won’t try to describe how deeply I mourn her passing still. I know that she was the kindest, most generous spirit I have ever known, and that what is best in me I owe to her.”

“Life doesn't count for much unless you're willing to do your small part to leave our children – all of our children – a better world. Even if it's difficult. Even if the work seems great. Even if we don't get very far in our lifetime.”

“Our values call upon us to care about the lives of people we will never meet.”

“And I would shrug and play the question off, unable to confess that I could no longer distinguish between faith and mere folly, between faith and simple endurance; that while I believed in the sincerity I heard in their voices, I remained a reluctant skeptic, doubtful of my own motives, wary of expedient conversion, having too many quarrels with God to accept a salvation too easily won.”

“There will be setbacks and false starts. There are many who won't agree with every decision or policy I make as president. And we know the government can't solve every problem. But I will always be honest with you about the challenges we face. I will listen to you, especially when we disagree. And, above all, I will ask you to join in the work of remaking this nation, the only way it's been done in America for 221 years -- block by block, brick by brick, calloused hand by calloused hand.”

“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.”

“No, no. I have been practicing...I bowled a 129. It's like -- it was like Special Olympics, or something." --making an off-hand joke during an appearance on "The Tonight Show", March 19, 2009”