Here's the truth: the Soviet Union had thousands of nuclear weapons, and Iran doesn't have a single one. But when the world was on the brink of nucle… - Barack Obama

Don’t just download the latest app, help redesign it. Don’t just play on your phone, program it.

And finally, let’s remember that peace with justice depends on our ability to sustain both the security of our societies and the openness that defines them. Threats to freedom don’t merely come from the outside. They can emerge from within -- from our own fears, from the disengagement of our citizens.

And when I think back to my journey, my past, I think the most important thing for -- and maybe the most important thing for all the young people here -- is to realize that you really can have an impact on the world; you can achieve your dreams. But in order to do so, you have to focus not so much on a title or how much money you’re going to make, you have to focus more on what kind of influence and impact are you going to have on other people’s lives -- what good can you do in the world. Now, that may involve starting a business, but if you want to start a business you should be really excited about the product or the service that you’re making. It shouldn’t just be how much money I can make -- because the business people who I meet who do amazing things, like Bill Gates, who started Microsoft -- they’re usually people who are really interested in what they do and they really think that it can make a difference in people’s lives. If you want to go into government, you shouldn’t just want to be a particular government official. You should want to go into government because you think it can help educate some children, or it can help provide jobs for people who need work. So I think the most important thing for me was when I started thinking more about other people and how I could have an impact in my larger society and community, and wasn’t just thinking about myself. That’s when I think your dreams can really take off -- because if you’re only thinking about you, then your world is small; if you‘re thinking about others, then your world gets bigger.