I decided to become a community organizer ... Change won't come from the top, I would say. Change will come from a mobilized grass roots.

I believe that the free enterprise system is the greatest engine of prosperity the world's ever known.

Independent economists say immigration reform will grow our economy and shrink our deficits by almost $1 trillion in the next two decades. And for good reason: when people come here to fulfill their dreams - to study, invent, and contribute to our culture - they make our country a more attractive place for businesses to locate and create jobs for everyone. So let's get immigration reform done this year.

I believe in term limits for presidents because I think that there is no doubt I'm a better president now than I was when I start. I would argue that I am the best president I've ever been over the last year or two. My team is more effective than it's ever been.But what is also true is that number one, this is grueling.

The next phase and this is part of what I'm interested in doing after I get out of the presidency is to make sure that I'm working with that next generation so that they understand you can't just rely on inspiration. There's a little perspiration involved in bringing about change too. That you have to be organized, that you have to vote even when it's not exciting.

I was watching a documentary that during the Bay of Pigs crisis JFK had about two weeks before anybody reported on it. Imagine that. I think it's fair to say that if something like that happens under a current president, they've got to figure out in about an hour what their response is.

Making your mark on the world is hard. If it were easy, everybody would do it. But it's not. It takes patience, it takes commitment, and it comes with plenty of failure along the way. The real test is not whether you avoid this failure, because you won't. it's whether you let it harden or shame you into inaction, or whether you learn from it; whether you choose to persevere.