There is so much investment in it of people's labor time that it will never make money. But there are other documentaries that you might make that are sort of on assignment for television that turn around in three to six months. Then the margin can be much be better for you because you're not spending three-and-a-half years on it. So I think if you're doing documentary films, that's sort of the way to look at it.

Bobby Fischer was hugely important for the American chess community because it put chess on the map - he made it possible for other chess players to make a living.

If you look at the gifted sportsman, like Tiger Woods, or Ryan Giggs, you can see how they have been built up to be so much more than one person could ever be.

I don't think you make documentary films to get your country house. If you're trying to gamble on that, you've very foolish.

Every film I make I feel like I am getting a mini-masters degree, it's a wonderful life path and you get to immerse yourself in an intriguing world for a couple of years.

I think all of us, looking back on our careers and our lives, there'll probably be a "road not taken" that we'll regret and mourn. Certainly, artists will always feel that way, especially when the path taken was more commercial than the one not taken.

When your entire life is focused around one goal and one goal only, and you have no other pursuits, it enables you to achieve enormous mastery.