Greg Rusedski

You do it for the highs, when you're totally engrossed and everything's flowing and whatever you want, you get. It's like magic. That's why you play the game. That's what it's for. That's why you work.

You can't really describe how difficult it is to deal with. It is any athlete's worst nightmare to be accused of cheating by taking drugs. It really is very difficult to put into words how it makes you feel.

When I have a creative insight, there is a high. I think back in the day, I made music as much as I did because it made me feel so good. I think you could argue that there is a creative addiction - but, you know, the healthy kind.

By irreducibly complex I mean a single system composed of several well-matched, interacting parts that contribute to the basic function, wherein the removal of any one of the parts causes the system to effectively cease functioning.