Iran has agreed to deepen our coordination as we work to locate Robert Levinson, missing from Iran for more than eight years. Even as we rejoice in the safe return of others, we will never forget about Bob. Each and every day our hearts are with the Levinson family, and we will not rest until their family is whole again.

I think that at a certain stage those early ambitions burn away, partly because you achieve something, you get something done, you get some notoriety. And then the particularities of who you are and what your deepest commitments are begin expressing themselves. You're not just chasing the idea of "me" being important, but you, rather, are chasing a particular passion.

I want people around the world to hear me. To all those who would do us harm, no act of terror will go unpunished. It will not dim the light of the values that we proudly present to the rest of the world. No act of violence shakes the resolve of the United States of America.

The Greek people are entrepreneurial.

We believed we could prepare our kids for a more competitive world. And today, our younger students have earned the highest math and reading scores on record. Our high school graduation rate has hit an all-time high. And more Americans finish college than ever before.

Obama said if elected his government would "harness technology to confront the biggest challenges that America faces".

A child's course in life should be determined not by the zip code she's born in, but by the strength of her work ethic and the scope of her dreams.