In this scene from The Empire Strikes Back, Yoda explains to Luke Skywalker some of the key principles about the Law of Attraction: use the force (aka the field, the divine matrix,etc) and the importance of belief. In particular, he utters his most famous line: "Do or do not... there is no try." He also explains to Luke that his lack of belief is why he fails: "That is why you fail." Finally, he reminds Luke that we are spiritual beings having a human experience, not the other way around: "Luminous beings are we, not this crude matter."