If I tell you not to think of purple flying pigs, actually please stop thinking of purple flying pigs. 

We can feed our minds with all sorts of suggestions. When you tell a child to not run across the road as they could get hit by a car, it is a suggestion. The way we interpret those suggestions will signal to our brain a positive or negative event. Repetitive suggestions as we do when learning, are very powerful in the hypnosis process. The plan is to make the suggestions positive.