You can use it to give yourself positive, empowering suggestions when going to sleep for the desired goal achievement or behavior change. These techniques are also used in self-hypnosis. Say the same message in many ways:
Say: I have a good memory. Say: People say that I have a good memory.
Say: (your name) has a good memory. Say: My teachers say that I have a good memory.
Say: Everybody says that I have a good memory. Say: You have a good memory.