If you look at what happened, I came in the middle of the worst financial crisis since the Great Depression. And unlike Franklin Delano Roosevelt who waited, well, didn't take office until about three years into the Great Depression, it was happening just as I was elected.

Whether we like it or not, we remain a dominant military superpower.

To anyone out there who has ever been assaulted: You will never be alone. You are never alone. We have your back. I've got your back.

Angela [Merkel] and I also agreed the need for a comprehensive and humane response to the devastating humanitarian crisis in Syria and for the influx of migrants and refugees from around the world. We need to build on the progress achieved at the U.N. Refugee Summit, which yielded new commitments from some 50 nations and organizations.

I do want to once again speak directly to the Iranian people. Yours is a great civilization with a vibrant culture that has so much to contribute to the world - in commerce and in science and in arts. For decades, your government's threats and actions to destabilize your region have isolated Iran from much of the world, and now our governments are talking with one another. Following the nuclear deal, you, especially young Iranians, have the opportunity to begin building new ties with the world.

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

It's useful for activists just to be out there to keep you mindful and not get complacent, even if ultimately you think some of their criticism is misguided.