I can't tell you what it's like to be in Europe, for example, to be talking about the greatness of America. But the true greatness of America are the people.

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.

To be an enduring, great company, you have to build a mechanism for preventing or solving problems that will long outlast any one individual leader.

If Jesus is not your Lord, then Satan is.

Your malice and your striving to seek revenge are much more harmful to your health than they are to your antagonist.

If you are killed because you are a writer, that's the maximum expression of respect, you know.

I feel that everyone has a Hulk inside, and each of our Hulks is both scary and, potentially, pleasurable. That's the scariest thing about them.

The brain doesn't care about change. As the world's most sophisticated survival organ, the brain cares about loss.

I don't believe ever in shared office spaces. Peter talks a little bit about this, every good startup is a cult. It's very hard to create a cult if you're sharing space with people.

Courage is virtue which champions the cause of right.

We carry with us, as human beings, not just the capacity to be kind, but the very choice of kindness.

Thinking is the hardest and most exhausting of all labor; and hence many people shrink from it.