We all know that men and women can be good without faith. And we also know that faith is an incredibly important source of goodness in our country.

The advance of liberty is the path to both a safer and better world.

To those of you who received honours, awards and distinctions, I say, well done. And to the C students, I say, you too can be president of the United States.

You see, we'll never be able to compete in the 21st century unless we have an education system that doesn't quit on children, an education system that raises standards, an education that makes sure there's excellence in every classroom.

Concentration of greenhouse gases, especially CO2, have increased substantially since the beginning of the industrial revolution. And the National Academy of Sciences indicates that the increase is due in large part to human activity.

I'm oftentimes asked, What difference does it make to America if people are dying of malaria in a place like Ghana? It means a lot. It means a lot morally, it means a lot from a -- it's in our national interest.

Today, the government of a free Afghanistan is fighting terror, Pakistan is capturing terrorist leaders, Saudi Arabia is making raids and arrests, Libya is dismantling its weapons programs, the army of a free Iraq is fighting for freedom, and more than three-quarters of al-Qaida's key members and associates have been detained or killed. We have led, many have joined, and America and the world are safer.