The thing the Buddhists and the Sufis have in common is a belief that religious certainties are destructive.

The exciting isolation of leaning against the wind on the highway hitchhiking, waiting for someone to stop and offer me a lift, perhaps to a town three miles down the road, perhaps to new friendship, perhaps to death.

In 1965, I was teaching a seminar on freedom when I told my students that the ultimate freedom lay in casting a dice to decide what to do. They were so shocked and fascinated that I knew I had to write the book.

Like the turtle's shell, the sense of self serves as a shield against stimulation and as a burden which limits mobility into possibly dangerous areas. The turtle rarely has to think about what's on the other side of his shell; whatever it is, it can't hurt him, can't even touch him. So, too, adults insist on the shell of a consistent self for themselves and their children and appreciate turtles for friends; they wish to be protected from being hurt or touched or confused or having to think. If a man can rely on consistency, he can afford not to notice people after the first few times. But I imagined a world in which each individual might be about to play the lover, the benefactor, the sponger, the attacker, the friend: and once known as one of the next day he might yet be anything. Would we pay attention to this person? Would life be boring? Would life be livable? I saw then clearly for the first time that the fear of failure keeps us huddled in the cave of self - a group of behavior patterns we have mastered and have no intention of risking failure by abandoning.

When I was a young man, barely 18, I discovered Jesus Christ as my personal saviour, and for six months I told my mother she was damned to hell. That wasn't much fun. I abandoned it.

'The Dice Man' is an anti-establishment cult novel, and you don't normally make studio films from such dark comedy material.