Unfortunately, you've grown up hearing voices that incessantly warn of government as nothing more than some separate, sinister entity that's at the root of all our problems. Some of these same voices also do their best to gum up the works. They'll warn that tyranny is always lurking just around the corner. You should reject these voices.

For America to get more entangled militarily in Syria is a serious step, and we have to do so making absolutely certain that we know who we are helping; that we're not putting arms in the hands of folks who eventually could turn them against us or allies in the region.

One of the things you discover about being president is that there are all these rules and norms and laws and you got to pay attention to them.

That window is closing. . . . Now, the clock is ticking. . . . We're not going to have these talks just drag out in a stalling process. . . . We haven't given away anything - other than the opportunity for us to negotiate

The criminal-justice system is, obviously, the sole source of racial tension in this country [USA] or the key institution to resolving the opportunity gap. It is a part of the broader set of challenges that we face in creating a more perfect union.

America must always lead on the world stage. If we don't, no one else will. The military that you have joined is, and always will be, the backbone of that leadership. But U.S. military action cannot be the only - or even primary - component of our leadership in every instance. Just because we have the best hammer does not mean that every problem is a nail.

Don't get cynical. Don't ever think you can't make a difference.