Revealing mistake: When Darth Vader and Ben are fighting, Darth's chestplate is on backwards and the belt "buckle" is as well. It appears that the entire shot was reversed. (01:26:20 - 01:27:15)
Star Wars (1977)
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Directed by: George Lucas
Starring: Alec Guinness, Anthony Daniels, Carrie Fisher, Harrison Ford, James Earl Jones, Mark Hamill, Kenny Baker, Peter Cushing, Peter Mayhew, David Prowse
Genres: Action, Adventure, Family, Fantasy, Sci-fi, Star Wars
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Darth Vader: I find your lack of faith disturbing.
Trivia: When Alec Guinness was offered the part of Obi-Wan Kenobi he was offered about $25,000 to play the part. After reading the script he was one of the few cast members who believed that the film would be a box office hit; he negotiated a deal for 2% of the gross royalties paid to the director, George Lucas, who received one fifth of the box office takings. Guinness made over $3,000,000, making him very wealthy in his later life.
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Answer: It is heavily implied that one who becomes a Force-Ghost achieves an untold level of power upon entering the state. Given that they have become a pure entity of the Force, it seems to back up the statement. Obi-Wan also becomes free to assist Luke in any case.
Darius Angel
In addition to this answer, I think Obi-wan also became powerful because he "let go." He did not feel a need to defeat Vader on this occasion - he was willing to surrender the fight and "move on" to a new state. Something that Vader might not currently understand.