I think I was righteous. I saw myself as the good guy in my own movie. I didn't get into many fights when I was younger, but when I did, they were righteous. I always thought I was defending something good. I fought for friends who couldn't fight for themselves. I was still being selfish and arrogant, but I was focused on what was fair and unfair.

The stock market to me was like a video game. When it went off, it was like turning the game off. It wasn't something I'd think about until I'd turn the machine on again.

We're capable of understanding that someone has to drop an atomic bomb on a town of innocent civilians, but not that others have to cut up prostitutes who spread disease and moral depravity in the slums of London. Hence we call the former realism and the latter madness.

At nineteen I was pretty sure I was going to be a professional soccer player. At that time I played for one of the Norwegian premier leagues. But I tore ligaments in both knees, so I started studying business administration and economics and became a financial analyst, and I worked at a brokerage firm as a stockbroker.

A rat is neither good nor evil. It does what a rat has to do.

Until the Eighties, Oslo was a rather boring town, but it's changed a lot, and is now much more cosmopolitan. If I go downtown, I visit the harbour to see the tall ships and the ferries, and to admire the modern architecture such as the Opera House or the new Astrup Fearnley Museum on the water's edge.

All my friends who wanted to write had got nowhere trying to write the great European novel. So I deliberately steered clear of that and set out to write something story-led.