ISIL is a terrorist organization, pure and simple. And it has no vision other than the slaughter of all who stand in its way.

At the dawn of the 21st century, where knowledge is literally power, where it unlocks the gates of opportunity and success, we all have responsibilities as parents, as librarians, as educators, as politicians, and as citizens to instill in our children a love of reading so that we can give them a chance to fulfill their dreams.

In a world of complex threats, our security and leadership depends on all elements of our power - including strong and principled diplomacy.

I will never forget that the only reason I'm standing here today is because somebody, somewhere stood up for me when it was risky. Stood up when it was hard. Stood up when it wasn't popular. And because that somebody stood up, a few more stood up. And then a few thousand stood up. And then a few million stood up. And standing up, with courage and clear purpose, they somehow managed to change the world.

So while I will never minimize the costs involved in military action, I am convinced that a failure to act in Libya would have carried a far greater price for America.

One of the great things about being commander in chief is getting to know our men and women in uniform in a very intimate way, whether it's visiting Walter Reed and seeing our wounded soldiers, or being on a base and talking to families, or interacting with them on missions. They're the best of the best: always thinking about the mission, not thinking about credit, not thinking about who's up front.

When you're a candidate and you say something that is inaccurate or controversial, it has less impact than it does when you're president of the United States. Everybody around the world's paying attention. Markets move. National security issues require a level of precision in order to make sure that you don't make mistakes.