The single biggest threat that we face is a nuclear weapon or some weapon of mass destruction. What that means is that we have to be extraordinarily aggressive and vigilant in controlling nuclear proliferation.

We all want the Greek people to prosper, to be able to provide a good life for their families and their children. That would be good for Greece, that would be good for the European Union, good for the United States, and ultimately, good for the world.

Don’t ever let anybody tell you that your efforts don’t matter or that your voice doesn’t count. Don’t ever believe that you can’t make a difference. You have.

Immigration keeps this country young, it keeps it dynamic, we have entrepreneurs and strivers who come here and are willing to take risks, and that's part of the reason why America historically has been successful.

With patient and firm determination, I am going to press on for jobs. I'm going to press on for equality. I'm going to press on for the sake of our children. I'm going to press on for the sake of all those families who are struggling right now. I don't have time to feel sorry for myself. I don't have time to complain. I am going to press on.

There is enough oil out there for world demand. It is true that a lot of what's driving oil prices up right now is not the lack of supply. There's enough supply.

It was into my father's image, the black man, son of Africa, that I'd packed all the attributes I sought in myself, the attributes of Martin and Malcolm, DuBois and Mandela.