In the movie "Return of the Jedi" Luke Skywalker is learning to be a Jedi from the Jedi Master, Yoda. Luke is performing an exercise of mind over matter when he fails the exercise. Yoda tells him to raise his X-Wing fighter from the murky water where it sank upon his arrival on Degoba. He says to Yoda, "I’ll try." To which Yoda replies "Do, or do not; there is no ’try.’" Luke extends his hand to the fighter, and begins to strain in his attempt to raise the fighter out of the water. Luke completely fails to levitate the heavy fighter out of the water. Yoda then quickly levitates the X-Wing fighter and sets it down on dry land. Luke said, "I didn’t believe it was
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