People of Berlin - people of the world - this is our moment. This is our time.

I know my country has not perfected itself. At times, we've struggled to keep the promise of liberty and equality for all of our people. We've made our share of mistakes, and there are times when our actions around the world have not lived up to our best intentions.

As I said last week in the wake of the grand jury decision, I think Ferguson laid bare a problem that is not unique to St. Louis or that area, and is not unique to our time, and that is a simmering distrust that exists between too many police departments and too many communities of color.

We need to keep making our streets safer and our criminal justice system fairer - our homeland more secure, our world more peaceful and sustainable for the next generation.

This is the moment when we must come together to save this planet. Let us resolve that we will not leave our children a world where the oceans rise and famine spreads and terrible storms devastate our lands.

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