I am convinced that whenever we exaggerate or demonize, oversimplify or overstate our case, we lose. Whenever we dumb down the political debate, we lose. For it's precisely the pursuit of ideological purity, the rigid orthodoxy and the sheer predictability of our current political debate, that keeps us from finding new ways to meet the challenges we face.

People of Berlin - people of the world - this is our moment. This is our time.

Now, I swore an oath to uphold the laws on the books... Now, I know some people want me to bypass Congress and change the laws on my own... Believe me, the idea of doing things on my own is very tempting. I promise you. Not just on immigration reform. But that's not how - that's not how our system works. That's not how our democracy functions. Thats not how our Constitution is written.

The biggest threat that we face right now is not a nuclear missile coming over the skies. It's in a suitcase. This is why the issue of nuclear proliferation is so important. It is the - the biggest threat to the United States is a terrorist getting their hands on nuclear weapons.

Even when you go up ramp, and you think about [Franklin D. Roosevelt] wheeling himself up, you know, got a little cigarette holder in his mouth, and it, that, that awe that you feel, that reverence that you feel for the place never entirely leaves.

I think there are hard-liners inside of Iran that think it is the right thing to do to oppose us, to seek to destroy Israel, to cause havoc in places like Syria or Yemen or Lebanon, if they don't change at all, we're still better off having the deal.

We have the power to make the world we seek, but only if we have the courage to make a new beginning.