Obviously I pray every day there's less casualty.

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.

you must not come lightly to the blank page.

The ancient Hebrews did not write the name of God. I often wish the Christians would follow suit, as never was a word more misused in writing and speaking than the name of the Lord.

I'm always amazed that my wife can handle different subjects - one day politics, the next day foreign policy. And she always has so much fun doing it. We make a good team.

I really enjoy going to a library and spending the day doing research - to me that is the most pleasurable part of writing the science book.

The mind goes on working no matter how we try to hold it back.

I'm helping launch the new Milky Way Chocolate Ice Cream Bar. I play an astrophysicist on television, and the name of the bar is Milky Way, so put two and two together, and here I am.

No art, however minor, demands less than total dedication if you want to excel in it.

If I can't be daring in my work or the way I live my life, then I don't really see the point of being on this planet.

Condiments are like old friends - highly thought of, but often taken for granted.

I think major reorganisation is not something the government's about to do.