I've been on Letterman a couple of times. I've been on Leno more than a couple times, and now Letterman hates me because I've been on Leno more than him. They're very jealous of one another, as you know.

I believe that if America does not lead, others will - others who do not share our interests and our values - and the world will grow darker, for our friends and for us.

My leadership will end the Obama era and begin a new era of American prosperity.

Opportunity expands when there is excellence and choice in education, when taxes are lowered, when every citizen has affordable, portable health insurance and when constitutional freedoms are preserved.

I must admit I found it astonishing to watch the candidates below Donald Trump beat up each other and never lay a glove on the front-runner. I mean, when I was running, everybody went after the front-runner and pointed out my weaknesses and foibles, and that's part of the normal primary process.

John Kerry was always in front of the camera but not out doing the hard work.

I am far from the first to conclude that Donald Trump lacks the temperament to be president.

Freedom. Freedom of religion. Freedom to speak their mind. Freedom to build a life. And yes, freedom to build a business. With their own hands. This is the essence of the American experience.

Perhaps religious conscience upsets the designs of those who feel that the highest wisdom and authority comes from government. But from the beginning, this nation trusted in God, not man. Religious liberty is the first freedom in our Constitution.

If Bill Weld were at the top of the ticket, it would be very easy for me to vote for Bill Weld for president.

Keep America strong. Strong in our values, strong in our economy, and strong in our military might. We hope to never have to use our military strength, but the world counts on a strong America to keep the worst actors from doing the worst things.

The real people who suffer when business is leaving or not successful are the people in the middle class.

I love practical jokes and humor. That there's frankly no joke that I don't think is funny. I love practical jokes, but I don't like being scared.

I understand that in some industries, the input cost of energy is a major factor in whether an industry is going to locate in the United States or go elsewhere.

Three years ago, this week, a newly elected President Obama faced the American people and he said, look, if I can't turn this economy around in three years, I'll be looking at a one-term proposition, and we're here to collect! You know the results. It's been 35 months of unemployment above 8 percent.

I would love to be president. I just concluded I was not the best person to carry forward the Republican torch.

Mike Dukakis, you know, he can't get a job mowing lawns.

Our economy is on the move and we are creating thousands of new jobs, but we need to keep our foot on the gas pedal.

Donald Trump represents a threat both to the party and to the country. I believe he makes the world far more dangerous, I believe he puts America's economy in jeopardy. And his temperament is totally unsuited for the presidency.

Frankly, I was born with a silver spoon.

It is time to cut out the mountains of waste and inefficiency and duplication in the federal government.

I'm very much engaged in the political battles, but I'm doing it as a supporter of Republicans out of conservatism rather than an active candidate.

I think people should have the common courtesy and judgment - the good judgment - not to be - not to offend other peoples' faiths.

I wish everybody in the Republican Party had rejected Mr. Trump and chosen someone else.