There will be setbacks and false starts. There are many who won't agree with every decision or policy I make as president. And we know the government… - Barack Obama

As a nation, out of this terrible tragedy, God has visited grace upon us, for he has allowed us to see where we’ve been blind. He has given us the chance, where we’ve been lost, to find our best selves. We may not have earned it, this grace, with our rancor and complacency, and short-sightedness and fear of each other -- but we got it all the same. He gave it to us anyway. He’s once more given us grace. But it is up to us now to make the most of it, to receive it with gratitude, and to prove ourselves worthy of this gift.

That's what I believe, in part because that's what a child like Christina Taylor Green believed. Imagine: here was a young girl who was just becoming aware of our democracy; just beginning to understand the obligations of citizenship; just starting to glimpse the fact that someday she too might play a part in shaping her nation's future. She had been elected to her student council; she saw public service as something exciting, something hopeful. She was off to meet her congresswoman, someone she was sure was good and important and might be a role model. She saw all this through the eyes of a child, undimmed by the cynicism or vitriol that we adults all too often just take for granted. I want us to live up to her expectations. I want our democracy to be as good as she imagined it. All of us — we should do everything we can to make sure this country lives up to our children's expectations.

The nature of our leadership will need to change with the times. As I said the first time I came to London as President, for the G20 summit, the days are gone when Roosevelt and Churchill could sit in a room and solve the world’s problems over a glass of brandy -– although I’m sure that Prime Minister Cameron would agree that some days we could both use a stiff drink.