G'mork: Fantasia has no boundaries.
Atreyu: That's not true! You're lying.
G'mork: Foolish boy. Don't you know anything about Fantasia? It's the world of human fantasy. Every part, every creature of it, is a piece of the dreams and hopes of mankind. Therefore, it has no boundaries.
Atreyu: But why is Fantasia dying, then?
G'mork: Because people have begun to lose their hopes and forget their dreams. So the Nothing grows stronger.
Atreyu: What is the Nothing?
G'mork: It's the emptiness that's left. It's like a despair, destroying this world. And I have been trying to help it.
Atreyu: But why?
G'mork: Because people who have no hope are easy to control; and whoever has the control... has the power!
~ The Never Ending Story