Let me say this as clearly as I can: No matter how sharp a grievance or how deep a hurt, there is no justification for killing innocents.

The Bush administration continues to coddle China, despite its continuing crackdown on democratic reform, its brutal subjugation of Tibet, its irresponsible export of nuclear and missile technology... Such forbearance on our part might have made sense during the Cold War when China was the counterweight to Soviet power. It makes no sense to play the China card now when our opponents have thrown in their hand.

Americans - not just starting thirty years ago but going back to the beginning, when we were rebelling against King George - we've always been of two minds about the government, which is why the framers wrote the Constitution the way they did.

Our overriding environmental challenge tonight is the worldwide problem of climate change, global warming, the gathering crisis that requires worldwide action.

What we need to do is to have a sensible approach to immigration. It needs to be open. It needs to be non-dogmatic and non-bigoted. We need to be firm but reasonable in the way we deal with the problem of illegal immigration. And we need to try to get as many of our immigrants who want to do so to become citizens as quickly as possible so that the American people will all see that this is a part of the process of American history, which is a good one for our country.

When we got organized as a country, [and] wrote a fairly radical Constitution, with a radical Bill of Rights, giving radical amounts of freedom to Americans, it was assumed that Americans who had that freedom would use it responsibly...When personal freedom is being abused, you have to move to limit it.

Profound and powerful forces are shaking and remaking our world. And the urgent question of our time is whether we can make change our friend and not our enemy.