A number of countries, including some who have loudly criticized the NSA, privately acknowledge that America has special responsibilities as the world's only superpower, that our intelligence capabilities are critical to meeting these responsibilities, and that they themselves have relied on the information we obtain to protect their own people.

I wonder, sometimes, whether men and women in fact are capable of learning from history--whether we progress from one stage to the next in an upward course or whether we just ride the cycles of boom and bust, war and peace, ascent and decline.

I've been involved in the intelligence side of the federal government for a long time. We all know that we have to have a balance between security to protect the American people and liberty. We take an oath to protect and defend the constitution and the American people.

There's no straight line to progress.

Throughout history, the arts and humanities have helped men and women around the globe grapple with the most challenging questions and come to know the most basic truths. In our increasingly interconnected world, the arts play an important role in both shaping the character that defines us and reminding us of our shared humanity. This month, we celebrate our Nation's arts and humanities, and we recommit to ensuring all Americans can access and experience them.

None of this is fair to you. And should it continue, it will make it more difficult to keep attracting the kind of driven, patriotic, idealist Americans to public service that our citizens deserved and that our system of self-government demands.

One of the things you learn as president is, as powerful as this office is, you have limited bandwidth. And the time goes by really quickly and you're constantly making choices, and there are pressures on you from all different directions - pressures on your attention, not just pressures from different constituencies. And so you have to be pretty focused about where can you have the biggest, quickest impact.