I have never had sexual relations with Monica Lewinsky. I've never had an affair with her.

A world without walls is the only sustainable world. . . . If the world is dominated by people who believe that their races, their religions, their ethnic differences are the most important factors, then a huge number of people will perish in this century.

The divide of race has been America's constant curse. Each new wave of immigrants gives new targets to old prejudices. Prejudice and contempt, cloaked in the pretense of religious or political conviction, are no different. They have nearly destroyed us in the past. They plague us still. They fuel the fanaticism of terror. They torment the lives of millions in fractured nations around the world. These obsessions cripple both those who are hated and, of course, those who hate, robbing both of what they might become.

We have the most religious freedom of any country in the world, including the freedom not to believe.

When people are feeling insecure, they'd rather have someone who is strong and wrong rather than somebody who is weak and right.

It is now conceivable that our children's children will know the term cancer only as a constellation of stars.

In our efforts to battle terrorism and cyber attacks and biological weapons, all of us must be extremely aggressive. We must protect our people from danger and keep America safe and free.