We will build our defenses beyond challenge, lest weakness invite challenge. We will confront weapons of mass destruction, so that a new century is spared new horrors.

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.

The pages are still blank, but there is a miraculous feeling of the words being there, written in invisible ink and clamoring to become visible

Language, as much as land, is a place. To be cut off from it is to be, in a sense, homeless.

If there is one clear lesson of our century, it is this: where aggression is tolerated, it multiplies.

Aberystwyth (n.) A nostalgic yearning which is in itself more pleasant than the thing being yearned for.

Our understanding of the world is achieved more effectively by conceptual improvements than by discovery of new facts

Only a madman would give good for evil

The need for growth, for development, for change, is fundamental to life.

The consensus is a very dangerous thing to get complacent about.

Those whose approval you seek most give you the least.

I do believe there is enormous possibility to change this world.