Russia's most precious resource is the brain power of this country. And you've got a lot of it. It's going to take a lot of brains in Russia to create a drain.

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 came here with love so live with passion and love everyone.

Freedom is born of self-discipline. No individual, no nation, can achieve or maintain liberty without self-control. The undisciplined man (or woman) is a slave to his own weaknesses.

Sometimes you have to get sicker before you can get better.

A free culture has been our past, but it will only be our future if we change the path we are on right now.

Today's competitiveness, so much imposed from without, is exhausting, not exhilarating; is unending-a part of one's social life, one's solitude, one's sleep, one's sleeplessness.

Sickness begets chaos, which, through hard work and a touch of grace, leads to growth and resurrection.

What important truth do very few people agree with you on?

What I know for sure is that you feel real joy in direct proportion to how connected you are to living your truth.

When you work without a script, you are in a sense working in a much more improvisational way than when you are prepared totally.

I admire that about the Republicans: The evidence does not faze them. They are not bothered at all by the facts.