How is it to be a ghost?

Everybody in our world will come to the end of their lives, but we prefer not to think about that and enjoy every moment. This is a small letter from one person who has been a ghost.
He left this letter in old house, where some young people had found it. I want you to listen to it.

...suddenly I understood: I’m not alive. Actually I’m not even material thing at all. I began laughing. Stupidly laughing. Every thief in the world dreamed about walking through the walls, and i can do that right now, but I’m not happy. I tried to touch anythig. I didn’t feel anything. Oh, maybe the God punished me? Yes, I was a thief. I should have been punished, though I didn’t think that i would be punished so strongly. I could get into any bank, but I didn’t need anything from there...

That ghost was famous disaster of one village. It used to scream at cold nights and kidnappe some children. Once it came to the young boy. He dreamed about having some extra abilities. The ghost told him to leave his thoughts. Boy didn’t. So some years later there were two terrible ghosts punished by their own unreal dreams.