Immigration keeps this country young, it keeps it dynamic, we have entrepreneurs and strivers who come here and are willing to take risks, and that's part of the reason why America historically has been successful.

I've come to embrace the notion that I haven't done enough in my life. I've come to confirm that one's title, even a title like president of the United States, says very little about how well one's life has been led. No matter how much you've done or how successful you've been, there's always more to do, always more to learn, and always more to achieve.

I do believe, separate and apart from any particular election or movement, that we are going to have to guard against a rise in a crude sort of nationalism or ethnic identity or tribalism that is built around an us and a them.

That bright blue ball rising over the moon's surface, containing everything we hold dear - the laughter of children, a quiet sunset, all the hopes and dreams of posterity - that's what's at stake. That's what we're fighting for. And if we remember that, I'm absolutely sure we'll succeed.

If we're not vigilant foreign countries can have an impact on the political debate in the United States in ways that might not have been true 10, 20, 30 years ago in - in part because of the way news is transmitted and in part because so many people are skeptical of mainstream news organizations that - everything's true and everything's false.

There was never a promise that race relations in America would be entirely resolved during my presidency or anybody's presidency. I mean, this has been a running thread - and - and fault line in American life and American politics since its founding.

Acts of sacrifice and decency without regard to what's in it for you create a ripple effect. Ones that lift up families and communities, that spread opportunity.