The walls between old allies on either side of the Atlantic cannot stand. The walls between the countries with the most and those with the least cannot stand. The walls between races and tribes; natives and immigrants; Christian and Muslim and Jew cannot stand. These now are the walls we must tear down. We know they have fallen before.

No challenge poses a greater threat to future generations than climate change.

I am confident that Assad's days are numbered. But what we can't do is to simply suggest that, as Governor Romney at times has suggested, that giving heavy weapons, for example, to the Syrian opposition is a simple proposition that would lead us to be safer over the long term.

Globalization is a fact, because of technology, because of an integrated global supply chain, because of changes in transportation. And we're not going to be able to build a wall around that.

We are a people of improbable hope.

My abiding faith in the American people is undiminished. That's still what drives me every single day.

Be the best father you can be to your children. Because nothing is more important.