We now live in a world where the most valuable skill you can sell is knowledge. Revolutions in technology and communication have created an entire economy of high-tech, high-wage jobs that can be located anywhere there's an internet connection. And today, a child in Chicago is not only competing for jobs with one in Boston, but thousands more in Bangalore and Beijing who are being educated longer and better than ever before.

I don't think we should ever accept the idea that someone can come along and take away our safety and our freedom.

I confess to wincing every so often at a poorly chosen word, a mangled sentence, an expression of emotion that seems indulgent or overly practiced. I have the urge to cut the book by fifty pages or so, possessed as I am with a keener appreciation for brevity.

The values that we talked about, the values democracy and free speech and international norms and rule of law, respecting the ability of other countries to determine their own destiny and preserve their sovereignty and territorial integrity. Things are not something that we can set aside.

The notion that we would condition Iran not getting nuclear weapons in a verifiable deal on Iran recognizing Israel is really akin to saying that we won't sign a deal unless the nature of the Iranian regime completely transforms. And that is, I think, a fundamental misjudgment.

The friendship that we established early on in our marriage ... that carries you through tough times. That and a good sense of humor.

Democracy is hard work.