If you want to see where "Law of Attraction" BS gets you, look at the dead bodies in James Arthur Ray's bogus sweatlodge.
The Powerlessness of Positive Thinking (The New Yorker)
...It’s just as hard to believe that the heroes in Byrne’s books—let alone a feverishly productive polymath like Goethe or the notoriously irritable Beethoven—succeeded because they cultivated good thoughts. Moreover, as the journalist Oliver Burkeman noted in “The Antidote: Happiness for People Who Can’t Stand Positive Thinking,” “Ceaseless optimism about the future only makes for a greater shock when things go wrong; by fighting to maintain only positive beliefs about the future, the positive thinker ends up being less prepared, and more acutely distressed, when things eventually happen that he can’t persuade himself to believe are good.”
Burkeman is onto something. According to a great deal of research, positive fantasies may lessen your chances of succeeding. In one experiment, the social psychologists Gabriele Oettingen and Doris Mayer asked eighty-three German students to rate the extent to which they “experienced positive thoughts, images, or fantasies on the subject of transition into work life, graduating from university, looking for and finding a job.” Two years later, they approached the same students and asked about their post-college job experiences. Those who harbored positive fantasies put in fewer job applications, received fewer job offers, and ultimately earned lower salaries. The same was true in other contexts, too. Students who fantasized were less likely to ask their romantic crushes on a date and more likely to struggle academically. Hip-surgery patients also recovered more slowly when they dwelled on positive fantasies of walking without pain.