"Jack is here because he has to do something. He can't be told what it is. He's got to find it himself. Sometimes you can just hop in the back of someone's cab and tell them what they have to do. Other times you have to let them look out at the ocean for a while."- Jacob
About this creation
The scene in episode 4 of the final season where Jack and Hurley journey to an ancient lighthouse on the island to set the mirror so that "someone" could find the island. After seeing a glimpse of his old house in the mirror, Jack smashes it to pieces. Jacob appears and tells Hurley that Jack has to find his purpose and that he has something important to do.