One voice can change a room, and if one voice can change a room, then it can change a city, and if it can change a city, it can change a state, and if it change a state, it can change a nation, and if it can change a nation, it can change the world. Your voice can change the world.

Sanctions alone could not stop Iran's nuclear program. But they did help bring Iran to the negotiating table.

Here in the United States, hopefully, what we're building are not just pyramids, are not icons to one pharaoh. What we're building is a culture and a way of living together that we can look back on and say, [This] was good, was inclusive, was kind, was innovative, was able to fulfill the dreams of as many people as possible.

I have never had to travel more than thirty seconds from home to office, and it's because of that that I've been able to maintain, really a family life that has nurtured and sustained me during this time [of presidency].

Our environment is too important to neglect and it's time for the federal government to focus on real solutions and live up to their promises.

We've got to make sure that we rebuild the infrastructure in America, because we used to be - have the best bridges, the best roads, the best airports. And now, when you go to China or you go to Europe, you see that they are outstripping us in terms of infrastructure. And if we put people back to work, that would be good not only in the short term, but it would also lay the foundation, the framework for long-term economic and job growth.

It wasn't until about a year, year and a half in where I began to realize that the Pentagon and our national-security apparatus and the CIA were all getting too comfortable with the technology as a tool to fight terrorism, and not being mindful enough about how that technology is being used and the dangers of a form of warfare that is so detached from what is actually happening on the ground. And so we initiated this big process to try to get it in a box.