Look at the streets! The people have smiles on their faces, they're hustling and bustling and going places, they're well-dressed, there's lots of construction going on. It's kind of hard to feel sorry for an economy like this.

[Jeb Bush] could, as I describe it, run the railroad.[John] Kasich could run the railroad. Hillary Clinton can run the railroad. Running the railroad is the most important thing. You have got 4 million employees; you've got to make the system work, and it doesn't work very well.

The cold harsh reality is that we have to balance the budget.

I will say that walking down the street, getting on the subway, taking the elevator, if there's one or two people and they say, 'Great job, Mayor,' that is a real turn-on. I mean, anybody that wouldn't find that satisfying, rewarding, exciting, thrilling - I think they should see the doctor.

You have to understand, we have better communications and better transportation, so people know what's available elsewhere and can get a message out, and you can move things. And you [can] say that the economy is more unpredictable.

The people who are worried about privacy have a legitimate worry. But we live in a complex world where you're going to have to have a level of security greater than you did back in the olden days, if you will. And our laws and our interpretation of the Constitution, I think, have to change.

If you don't encounter setbacks in your career, if you don't have doubts and disappointments , let me tell you, you're not dreaming big enough.