It was young people who stubbornly insisted on justice, stubbornly refused to accept the world as it is that transformed not just the country but transformed the world.

There are institutional obligations I have to carry out that are important for a president of the United States to carry out, but may not always align with what I think would move the ball down the field on the issues that I care most deeply about.

The only reason I send a single young man or woman in uniform anywhere in the world is because I think it's necessary to keep us safe.

I thought I could start over, you see. But now I know you can never start over. Not really. You think you have control, but you are like a fly in somebody else's web. Sometimes I think that's why I like accounting. All day, you are only dealing with numbers. You add them, multiply them, and if you are careful, you will always have a solution. There's a sequence there. An order. With numbers, you can have control.

Any so-called leader who does not take this issue (climate change) seriously or treats it like a joke is not fit to lead

My particular passion for Lincoln dates back from my earliest memories of politics.

And to all those who have wondered if Americas beacon still burns as bright - tonight we proved once more that the true strength of our nation comes not from our the might of our arms or the scale of our wealth, but from the enduring power of our ideals: democracy, liberty, opportunity, and unyielding hope. For that is the true genius of America - that America can change. Our union can be perfected. And what we have already achieved gives us hope for what we can and must achieve tomorrow.