In "Dr. Linus", Richard states, if a person is touched by Jacob, it is considered a gift. In Richard's case, Jacob somehow bestowed upon him the ability to remain ageless and effectively immortal, and unable to die by his own hand. Richard tells Jack, he could kill him, however. In "The Substitute" the Man in Black describes an ability of Jacob that can somehow change an individual's destiny or "push" them onto a specific path - in the case of the Candidates a path which brought them to the Island.
The only individuals that have been seen to have been touched by Jacob in the series are: Kate,...
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