Chasing Your Dream

Why do people use the verb "Chase" to describe the action of pursuing one's dream? It seems that the dream is a moving, elusive creature. If you don't run after it, it will just disappear. Do dreams run around? Are they hard to catch? If you have ever been to a audition place for some kind of role in movies, print ads, or TV commercials, you will know what I am talking about. Watching everybody there, you see so many people for one role. It's very obvious that it's just a dream for a majority of people. It's a dream and everybody is chasing it.

If we stop chasing, will our dreams come to us?