One reason why hypnosis can be so effective is the use of pyramiding.
The suggestions given to the person receiving hypnosis are positive and empowering. They are then, like pyramid, one build on top of another until a desired height is attained through the use of words that have quite similar meaning.
Example in this statement:
“You feel calm and when you feel calm, you are more peaceful, and when you feel peaceful, you are in harmony…..”