If you were successful, somebody along the line gave you some help... Somebody helped to create this unbelievable American system that we have that allowed you to thrive. Somebody invested in roads and bridges. If you’ve got a business - you didn’t build that. Somebody else made that happen.

You could analyze me and say that my father leaving and being absent was a motivator for early ambition, trying to prove myself to this apparition who had vanished. You could argue that me being a mixed kid in a place where there weren't a lot of black kids around might have spurred on my ambitions. You could go through a whole litany of things that sparked me wanting to do something important.

There’s only one thing we can be sure of, and that is the love that we have -- for our children, for our families, for each other. The warmth of a small child’s embrace -- that is true. The memories we have of them, the joy that they bring, the wonder we see through their eyes, that fierce and boundless love we feel for them, a love that takes us out of ourselves, and binds us to something larger -- we know that’s what matters. We know we’re always doing right when we’re taking care of them, when we’re teaching them well, when we’re showing acts of kindness. We don’t go wrong when we do that.

It was basic research in the photoelectric field-in the photoelectric effect that would one day lead to solar panels. It was basic research in physics that would eventually produce the CAT scan. The calculations of today's GPS satellites are based on the equations that Einstein put to paper more than a century ago.

We built this country by making things, by producing goods we could sell.

Those of us in positions of responsibility, we'll need to be less concerned with the judgment of special interests and well-connected donors, and more concerned with the judgment of posterity.

The United States is not, and never will be, at war with Islam.