A stalker must not enter the room. A stalker must not enter the Zone with an ulterior motive. Yes, you’re right, I’m a louse. I haven’t done any good in this world, and I can’t do any. I couldn’t give anything even to my wife. I can’t have any friends either. But don’t take from me what’s mine! They’ve already taken everything from me back there, behind the barbed wire. So all that’s mine is here. You understand? Here! In the Zone! My happiness, my freedom, my self-respect, it’s all here! I bring people like me here, desperate and tormented. People who have nothing else to hope for.
– Tarkovsky, Stalker