If you're not a competitor, you've just got to go home.

Some people say I have attitude - maybe I do... but I think you have to. You have to believe in yourself when no one else does - that makes you a winner right there.

I don't focus on what I'm up against. I focus on my goals and I try to ignore the rest.

Just believe in yourself. Even if you don't, pretend that you do and, at some point, you will.

My motto is: I'm alive, so that means I can do anything.

In my mind, I'm always the best. If I walk out on the court (and) I think the next person is better, I've already lost.

Of course, I want to be number one. But being happy and healthy is the most important thing.

Tennis is mostly mental. Of course, you must have a lot of physical skill, but you can't play tennis well and not be a good thinker. You win or lose the match before you even go out there.

When you lose, you're more motivated. When you win, you fail to see your mistakes and probably no one can tell you anything.

In the sports arena I would say there is nothing like training and preparation. You have to train your mind as much as your body.

If I cared deeply about what people thought of me, I probably would have never made it out of Compton, California.

You can always find an evolutionary quotation for anything. But the question is whether it's functional, which is not the same as being evolutionary.

Those who committed these cowardly acts may believe that they have shaken our resolve to defeat terrorism. They could not be more wrong.

There exists in human nature a strong propensity to depreciate the advantages, and to magnify the evils, of the present times.

We are born as innocents. We are polluted by advice.

Of course men play roles, but women play roles too, blanker ones. They have, in the play of life, fewer good lines.

I grew up in a very bohemian environment in southern Sweden, so I was always, always, always in black jeans.

The war made possible for us the solution of a whole series of problems that could never have been solved in normal times.

A dead end street is a good place to turn around. Can't really fault the logic of that, unless you want to go down the dead end of course!

It has taken these many hundreds of millions of years to fine-tune the Earth to a point where it is suitable for the likes of us.

The increased global linkages promote economic growth in the world through two key mechanisms: the division of labor and the international spillovers of knowledge.