Think positively

In the Secret there were sentences which I had heard before a lot. In the past I didn't trust to these things but from the time I saw the person I like best, little by little I am thinking some of them are true; of course I believe that there should be lots of patience. In the film there was a sentence "thoughts become things" I touched an example of this. I know a person who someone had told him "you have an enemy who is a woman" this person had believed it and thought that the woman was doing bad and dangerous things to him. I was very surprised because I didn't see anything; but, because he thought so, he saw so.