Well it's a tricky subject. Some believe that they will work if you keep thinking about, thus channeling the energy of the universe into your life wish. Also known as the law of attraction. If you would love to know more about this method I recommend you read The Secret by Rhonda Byrne. It is a good read if you have time for it. I highly recommend you read it to understand how you can make your wishes come true due to the law of attraction.