Reinz:
That's one of my favorite quotes from that movie.
And here is another bit of dialogue from the film that I think summarizes rather well some of the sociopathic personalities seen throughout history and unfortunately existing among us today:
Wyatt Earp: What makes a man like Ringo, Doc? What makes him do the things he does?
Doc Holliday: A man like Ringo has got a great big hole, right in the middle of him. He can never kill enough, or steal enough, or inflict enough pain to ever fill it.
Wyatt Earp: What does he need?
Doc Holliday: Revenge.
Wyatt Earp: For what?
Doc Holliday: Bein' born.
[Edited typo.]