Having purpose. I had purpose during my presidency, and I've got purpose after my presidency.

Fool me once, shame on - shame on you. Fool me - you can't get fooled again.

Leadership to me means duty, honor, country. It means character, and it means listening from time to time.

Terrorist attacks can shake the foundations of our biggest buildings, but they cannot touch the foundation of America. These acts shatter steel, but they cannot dent the steel of American resolve.

Freedom itself was attacked this morning by a faceless coward, and freedom will be defended.

Our enemies are innovative and resourceful, and so are we. They never stop thinking about new ways to harm our country and our people, and neither do we.

Freedom is not our gift to the world it is God's gift to humanity.

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.

I do solemnly swear that I will faithfully execute the Office of President of the United States, and will to the best of my Ability, preserve, protect and defend the Constitution of the United States

A dictatorship would be a heck of a lot easier, there's no question about it.

I believe a marriage is between a man and a woman.

Never give up on your existence.

The benefit of appearing so young is I'm constantly underestimated

Yet, as only New Yorkers know, if you can get through the twilight, you'll live through the night.

For frequent tears have run; The colours from my life.

Success in solving the problem depends on choosing the right aspect, on attacking the fortress from its accessible side.

By the time I got to record my first album, I was 26, I didn't need pen or paper - my memory had been trained just to listen to a song, think of the words, and lay them to tape.

Your numbness is something perhaps you cannot help. It is what the world has done to you. But your coldness. That is what you do to the world.

HIV/AIDS is the greatest danger we have faced for many, many centuries. HIV/AIDS is worse than a war. It is like a world war. Millions of people are dying from it.

Out of anger comes controversy, out of controversy comes conversation, out of conversation comes action.